Certified Dermatology Tech (CDT) — Questions and Answers

Question 1: Which finding on dermoscopy is most associated with melanoma?

Atypical pigment network with regression structures (Correct answer)
Arborizing vessels
Comma-shaped vessels
Milia-like cysts

Correct answer: Atypical pigment network with regression structures

Atypical pigment network, regression structures (white scar-like areas or blue-gray peppering), and irregular streaks are key dermoscopic features of melanoma.

Question 2: What is the PRIMARY purpose of continuing education requirements in Wound Care & Healing for CDT professionals?

Fulfilling mandatory regulatory requirements only
Maintaining current knowledge and competency as the field evolves (Correct answer)
Networking with other professionals in the field
Earning additional credentials for career advancement

Correct answer: Maintaining current knowledge and competency as the field evolves

Continuing education in Wound Care & Healing ensures professionals maintain current knowledge and skills as standards, technologies, and best practices evolve in the Certified Dermatology Tech field.

Question 3: The hair follicle cycle consists of three phases. Which phase represents active hair growth?

Telogen
Catagen
Anagen (Correct answer)
Exogen

Correct answer: Anagen

Anagen is the active growth phase of the hair follicle cycle, during which hair matrix cells proliferate and the hair shaft elongates.

Question 4: A patient refuses a recommended skin biopsy after being fully informed. The tech should:

Document the refusal and respect the patient's decision (Correct answer)
Persuade the patient to reconsider for their own health
Proceed with the biopsy citing medical necessity
Contact the patient's family to override the refusal

Correct answer: Document the refusal and respect the patient's decision

Respecting patient autonomy means honoring an informed refusal; the refusal should be documented and signed if possible.

Question 5: How long before PDT light activation is aminolevulinic acid (ALA) typically applied?

1–3 hours (Correct answer)
5 minutes
30 minutes
24 hours

Correct answer: 1–3 hours

ALA is applied 1–3 hours before light activation to allow adequate uptake and concentration in target abnormal cells.

Question 6: A patient with chronic plaque psoriasis is being considered for phototherapy. Which form of phototherapy is most commonly used as first-line in this setting?

PUVA (psoralen + UVA)
UVA1 therapy
Broadband UVB (BB-UVB)
Narrowband UVB (NB-UVB) at 311 nm (Correct answer)

Correct answer: Narrowband UVB (NB-UVB) at 311 nm

Narrowband UVB (NB-UVB) at 311 nm is the preferred first-line phototherapy for psoriasis due to its efficacy, favorable safety profile, and lack of need for psoralen.

Question 7: Which of the following is the most common site of melanoma in males in the United States?

Lower extremities
Head and neck
Trunk (back) (Correct answer)
Upper extremities

Correct answer: Trunk (back)

In males, the trunk—particularly the back—is the most common anatomical location for melanoma in the United States.

Question 8: A tech should remove gloves using the 'glove-in-glove' technique to:

Avoid self-contamination by touching the outer contaminated surface (Correct answer)
Ensure gloves can be reused after decontamination
Maintain grip on instruments during removal
Prevent tearing the glove material

Correct answer: Avoid self-contamination by touching the outer contaminated surface

The glove-in-glove (beak) technique allows the contaminated outer surfaces to fold inward during removal, protecting bare skin from contact with pathogens.

Question 9: Lichen planus is classically described by the '6 P's.' Which of the following is NOT one of the 6 P's?

Pustular (Correct answer)
Purple
Pruritic
Polygonal

Correct answer: Pustular

The 6 P's of lichen planus are Pruritic, Purple, Polygonal, Planar, Papules, and Plaques — pustular lesions are not characteristic of lichen planus.

Question 10: A patient presents with sharply demarcated, silvery-scaled plaques on the elbows and knees. Which pathophysiological mechanism is primarily responsible for this condition?

Accelerated keratinocyte proliferation (Correct answer)
Excessive melanin production
Sebaceous gland hyperplasia
Autoimmune destruction of melanocytes

Correct answer: Accelerated keratinocyte proliferation

Psoriasis is characterized by accelerated keratinocyte proliferation, causing rapid skin cell turnover that leads to the classic silvery scales.

Question 11: What is the PRIMARY purpose of continuing education requirements in Topical Medication Administration for CDT professionals?

Earning additional credentials for career advancement
Networking with other professionals in the field
Maintaining current knowledge and competency as the field evolves (Correct answer)
Fulfilling mandatory regulatory requirements only

Correct answer: Maintaining current knowledge and competency as the field evolves

Continuing education in Topical Medication Administration ensures professionals maintain current knowledge and skills as standards, technologies, and best practices evolve in the Certified Dermatology Tech field.

Question 12: What is one primary goal of infection control protocols?

Reduce noise in the clinic
Prevent disease transmission (Correct answer)
Improve comfort of tools
Save time during cleaning

Correct answer: Prevent disease transmission

The overarching goal of infection control protocols in any healthcare setting is to prevent the spread of infectious diseases among patients, staff, and visitors. These protocols encompass a range of practices designed to break the chain of infection and maintain a safe environment.

Question 13: How should contaminated instruments be handled?

Disposed of in biohazard containers (Correct answer)
Placed in regular trash
Rinsed and reused
Stored for later cleaning

Correct answer: Disposed of in biohazard containers

Contaminated instruments, especially those that have come into contact with blood or other potentially infectious materials, pose a significant risk of disease transmission. Disposing of them in designated biohazard containers ensures they are handled safely and processed according to strict protocols to prevent infection spread and protect staff.

Question 14: Keloid scars differ from hypertrophic scars in that keloids:

Remain within the original wound boundaries
Extend beyond the original wound margins (Correct answer)
Regress spontaneously over time
Develop only on the palms and soles

Correct answer: Extend beyond the original wound margins

Keloids invade surrounding normal tissue beyond the original wound boundaries, whereas hypertrophic scars remain confined within the wound margins.

Question 15: Which layer of the epidermis contains the stem cells responsible for continuous skin renewal?

Stratum granulosum
Stratum spinosum
Stratum basale (Correct answer)
Stratum corneum

Correct answer: Stratum basale

The stratum basale (basal layer) contains mitotically active stem cells that continuously divide to replenish the epidermis.

Question 16: What is keratin?

A connective tissue
A pigment
A protein providing structure and protection (Correct answer)
A hormone

Correct answer: A protein providing structure and protection

Keratin is a tough, fibrous protein that is the primary structural component of the epidermis, hair, and nails. It provides strength, impermeability, and protection against physical damage, water loss, and microbial invasion, forming the skin's protective barrier.

Question 17: Which epidermal layer is characterized by the presence of keratohyalin granules visible on histology?

Stratum spinosum
Stratum granulosum (Correct answer)
Stratum basale
Stratum lucidum

Correct answer: Stratum granulosum

The stratum granulosum is defined by the presence of keratohyalin granules containing profilaggrin, which contributes to cornification.

Question 18: A patient is prescribed a topical medication with instructions to apply 'sparingly.' This means:

Apply a thin layer using just enough to cover the area (Correct answer)
Skip applications when symptoms improve
Apply a thick layer for maximum effect
Apply only to the most affected spots, ignoring surrounding skin

Correct answer: Apply a thin layer using just enough to cover the area

Applying sparingly means using a thin layer — just enough to lightly coat the affected area — to minimize systemic absorption and side effects.

Question 19: What is the typical frequency of narrowband UVB phototherapy sessions per week?

Once per month
2–3 times per week on non-consecutive days (Correct answer)
Once per week only
Daily (7×/week)

Correct answer: 2–3 times per week on non-consecutive days

Narrowband UVB is administered 2–3 times per week on non-consecutive days to allow skin recovery while maintaining therapeutic effect.

Question 20: Which immunofluorescence pattern is classically associated with pemphigus vulgaris on direct immunofluorescence (DIF)?

Intercellular IgG in a 'fishnet' pattern throughout the epidermis (Correct answer)
Granular IgA in dermal papillae
Homogeneous IgM deposits in the dermis
Linear IgG along the basement membrane zone

Correct answer: Intercellular IgG in a 'fishnet' pattern throughout the epidermis

Pemphigus vulgaris shows intercellular IgG deposits between keratinocytes in a characteristic 'fishnet' or 'chicken-wire' pattern on DIF.

Question 21: Why is hand hygiene critical in a dermatology setting?

To look professional
To warm hands in cold rooms
To reduce infection spread (Correct answer)
To avoid lotion use

Correct answer: To reduce infection spread

Hand hygiene is paramount in any healthcare setting, including dermatology, to prevent the transmission of pathogens between healthcare providers, patients, and the environment. It significantly reduces the risk of healthcare-associated infections, protecting both patients and staff.

Question 22: Elastic fibers in the dermis are composed primarily of which protein?

Collagen
Fibronectin
Keratin
Elastin (Correct answer)

Correct answer: Elastin

Elastic fibers consist primarily of elastin protein cross-linked with fibrillin microfibrils, allowing the skin to stretch and recoil.

Question 23: Which Wood's lamp finding is characteristic of erythrasma caused by Corynebacterium minutissimum?

Coral-red fluorescence (Correct answer)
Yellow-green fluorescence
Green fluorescence
Blue-white fluorescence

Correct answer: Coral-red fluorescence

Erythrasma fluoresces coral-red under Wood's lamp due to porphyrins produced by Corynebacterium minutissimum.

Question 24: Which layer of the skin is primarily responsible for thermoregulation and energy storage due to its adipose tissue content?

Reticular dermis
Papillary dermis
Hypodermis (Correct answer)
Epidermis

Correct answer: Hypodermis

The hypodermis (subcutaneous layer) contains adipocytes that store energy and insulate the body, contributing significantly to thermoregulation.

Question 25: A patient presents with grouped vesicles on an erythematous base in a dermatomal distribution on the trunk. What is the causative organism?

Human herpesvirus 8
Varicella-zoster virus (Correct answer)
Coxsackievirus A16
Herpes simplex virus type 1

Correct answer: Varicella-zoster virus

Herpes zoster (shingles) is caused by reactivation of varicella-zoster virus (VZV) in dorsal root ganglia, producing a painful dermatomal vesicular eruption.

Question 26: The TIME wound bed preparation framework stands for Tissue, Infection/Inflammation, Moisture imbalance, and:

Topical antibiotic application
Temperature elevation
Tissue oxygenation
Edge of wound/Epithelial advancement (Correct answer)

Correct answer: Edge of wound/Epithelial advancement

The 'E' in TIME refers to Edge of wound/Epithelial advancement, assessing whether wound edges are progressing and epithelializing.

Question 27: The nail plate is composed primarily of:

Hard keratin (alpha-keratin) (Correct answer)
Soft keratin with lipids
Type IV collagen
Hyaline cartilage

Correct answer: Hard keratin (alpha-keratin)

The nail plate is made of hard, densely packed alpha-keratin filaments produced by the nail matrix cells.

Question 28: A patient has a wound that has been open for 10 weeks with no signs of healing progression. This is classified as:

Acute wound
Traumatic wound
Chronic wound (Correct answer)
Surgical wound

Correct answer: Chronic wound

A wound that fails to progress through normal healing stages within 4–6 weeks is classified as a chronic wound.

Question 29: A patient presents with a rash that blanches completely with diascopy. This finding most likely indicates:

Purpura due to vasculitis
Fixed drug eruption
Hemosiderin deposition
Erythema caused by vascular dilation (Correct answer)

Correct answer: Erythema caused by vascular dilation

Blanching on diascopy indicates that redness is caused by blood in dilated vessels, not extravasated blood, which is consistent with inflammatory erythema.

Question 30: What action should be taken after a needle-stick injury?

Keep it a secret
Apply bandage only
Wash and report the incident (Correct answer)
Ignore unless symptoms appear

Correct answer: Wash and report the incident

After a needle-stick injury, immediate action is critical to minimize the risk of bloodborne pathogen transmission. Washing the affected area thoroughly with soap and water and promptly reporting the incident allows for proper medical evaluation, post-exposure prophylaxis if necessary, and documentation for workplace safety.

Question 31: When is it appropriate to use a shave biopsy?

Superficial raised lesions like seborrheic keratoses or nevi above the skin plane (Correct answer)
Suspected melanoma requiring depth measurement
Deep nodular lesions requiring subcutaneous tissue
Nail matrix biopsies

Correct answer: Superficial raised lesions like seborrheic keratoses or nevi above the skin plane

Shave biopsies are appropriate for superficial, raised lesions because they cleanly remove the elevated portion without requiring sutures.

Question 32: What type of collagen predominates in the reticular dermis and provides tensile strength to the skin?

Type III collagen
Type VII collagen
Type I collagen (Correct answer)
Type IV collagen

Correct answer: Type I collagen

Type I collagen is the most abundant collagen in the reticular dermis and is responsible for the skin's tensile strength.

Question 33: What is the primary function of the skin's stratum corneum?

Immune surveillance
Sensory reception
Melanin production
Barrier against water loss and pathogens (Correct answer)

Correct answer: Barrier against water loss and pathogens

The stratum corneum consists of dead, flattened corneocytes embedded in lipid lamellae that form the primary barrier against transepidermal water loss and external pathogens.

Question 34: What is a hallmark symptom of eczema (atopic dermatitis)?

Hard scaly plaques
Itchy, inflamed skin (Correct answer)
Painless nodules
Smooth pigmentation loss

Correct answer: Itchy, inflamed skin

Eczema, particularly atopic dermatitis, is characterized by intensely itchy, red, and inflamed skin. Patients often experience dry, scaly patches that can sometimes blister or ooze, leading to significant discomfort and a strong urge to scratch.

Question 35: In Common Skin Conditions & Treatment, what is the FIRST step a CDT professional should take when encountering a new case or situation?

Conduct a comprehensive assessment and gather all relevant information (Correct answer)
Implement an immediate solution based on past experience
Document the situation and wait for further instructions
Consult with a supervisor before taking any action

Correct answer: Conduct a comprehensive assessment and gather all relevant information

In Common Skin Conditions & Treatment, a thorough initial assessment ensures all relevant factors are identified before deciding on an appropriate course of action. This systematic approach is fundamental to Certified Dermatology Tech practice.

Question 36: What is the recommended moisture level for optimal wound healing?

Saturated with saline
Alternating wet and dry cycles
Completely dry environment
Moist but not macerated (Correct answer)

Correct answer: Moist but not macerated

A moist wound environment accelerates epithelial cell migration and prevents desiccation, but excessive moisture causes maceration.

Question 37: Mast cells in the dermis play a central role in allergic and inflammatory skin reactions by releasing:

Sebum and wax esters
Melanin and eumelanin
Histamine and other vasoactive mediators (Correct answer)
Collagen and elastin

Correct answer: Histamine and other vasoactive mediators

Mast cell degranulation releases histamine, tryptase, and other mediators that cause vasodilation, increased vascular permeability, and pruritus in allergic reactions.

Question 38: A patient discloses they are HIV-positive before a procedure. The dermatology tech should:

Refuse the procedure citing safety concerns
Notify other staff members of the patient's status
Use enhanced isolation precautions beyond standard
Apply standard precautions as with all patients (Correct answer)

Correct answer: Apply standard precautions as with all patients

Standard precautions apply universally regardless of known infection status, and HIV disclosure does not require additional isolation measures.

Question 39: Which gauge needle is most appropriate for intradermal injection of allergens during patch testing?

22-gauge
18-gauge
27-gauge (Correct answer)
14-gauge

Correct answer: 27-gauge

A 27-gauge (or 25-gauge) needle is preferred for intradermal injections due to its fine caliber, which minimizes patient discomfort and allows precise intradermal delivery.

Question 40: What is the mechanism of action of salicylic acid in dermatologic products?

Anti-inflammatory action only
Keratolytic — softens and removes excess keratin (Correct answer)
Antifungal action
Direct antibacterial action

Correct answer: Keratolytic — softens and removes excess keratin

Salicylic acid is a keratolytic beta-hydroxy acid that dissolves intercellular cement between skin cells, promoting shedding of dead skin and clearing clogged pores.

Question 41: A patient with acne vulgaris has predominantly open and closed comedones with few inflammatory lesions. This is classified as:

Mild comedonal acne (Correct answer)
Severe nodulocystic acne
Acne fulminans
Moderate papulopustular acne

Correct answer: Mild comedonal acne

Predominantly comedonal lesions (blackheads and whiteheads) with minimal inflammation represent mild comedonal acne.

Question 42: What is the role of sebaceous glands?

Keratin production
Sweat production
Vitamin D synthesis
Sebum production (Correct answer)

Correct answer: Sebum production

Sebaceous glands are exocrine glands found in the skin, primarily associated with hair follicles. Their main function is to produce and secrete sebum, an oily substance that lubricates the skin and hair, helping to keep them moisturized and protected.

Question 43: Which skin function involves heat regulation?

Vitamin storage
Sensation
Immune protection
Thermoregulation (Correct answer)

Correct answer: Thermoregulation

Thermoregulation is the process by which the body maintains its core internal temperature. The skin plays a crucial role in this by regulating blood flow (vasodilation/vasoconstriction) and through sweat production, which cools the body via evaporation.

Question 44: A patient with xeroderma pigmentosum (XP) is at extreme risk for skin cancer because this condition impairs:

Melanin production in basal keratinocytes
T-cell mediated immune surveillance of atypical keratinocytes
Nucleotide excision repair of UV-induced DNA damage (Correct answer)
Filaggrin expression in the stratum corneum

Correct answer: Nucleotide excision repair of UV-induced DNA damage

XP is caused by defects in nucleotide excision repair genes, leaving UV-induced DNA photoproducts unrepaired and leading to very early and multiple skin cancers.

Question 45: Which antiseptic is contraindicated for use around the eyes in dermatology procedures?

Povidone-iodine
Benzalkonium chloride
Chlorhexidine gluconate (Correct answer)
Isopropyl alcohol 70%

Correct answer: Chlorhexidine gluconate

Chlorhexidine gluconate is ototoxic and can cause serious corneal damage and permanent hearing loss if it contacts eyes or ears.

Question 46: A dermatology tech is setting up for a PDT (photodynamic therapy) session. Which photosensitizing agent is topically applied before the activating light source?

Imiquimod
Methyl aminolevulinate (MAL) or aminolevulinic acid (ALA) (Correct answer)
Benzoyl peroxide
Fluorouracil (5-FU)

Correct answer: Methyl aminolevulinate (MAL) or aminolevulinic acid (ALA)

ALA or MAL is applied topically, absorbed preferentially by actinic keratoses and sebaceous glands, then converted to protoporphyrin IX, which is activated by the PDT light source to destroy abnormal cells.

Question 47: When applying liquid nitrogen via a spray device, the freeze time is extended to treat a larger, thicker lesion. This technique is best described as:

Closed probe technique
Open spray technique (Correct answer)
Pulsed spray technique
Spot freeze technique

Correct answer: Open spray technique

The open spray technique uses a handheld cryospray device directed at the lesion and can be adjusted in duration and distance to treat lesions of varying size and depth.

Question 48: Which is a breach of ethical conduct in dermatology care?

Discussing a patient case publicly (Correct answer)
Documenting consent forms
Respecting patient privacy
Providing educational brochures

Correct answer: Discussing a patient case publicly

Discussing a patient case publicly is a direct breach of patient confidentiality and ethical conduct. Healthcare professionals are bound by strict privacy rules, such as HIPAA, to protect sensitive patient information, and public disclosure violates trust and legal obligations.

Question 49: How does risk management apply to daily practice in Patient Education & Counseling for Certified Dermatology Tech professionals?

Through annual safety audits exclusively
Only through responding to incidents after they occur
By avoiding high-risk situations entirely
Through proactive identification of potential hazards and implementation of preventive measures (Correct answer)

Correct answer: Through proactive identification of potential hazards and implementation of preventive measures

Effective risk management in Patient Education & Counseling requires proactive hazard identification and preventive measures, not just reactive responses. This approach reduces incidents, improves outcomes, and protects both professionals and clients.

Question 50: A dermatology technician notices a biopsy specimen container is cracked and leaking formalin. What is the FIRST action to take?

Discard the container and re-biopsy the patient immediately
Rinse the container with water and reseal it
Proceed to send it to pathology with a note
Don the appropriate PPE and contain the spill following exposure protocols (Correct answer)

Correct answer: Don the appropriate PPE and contain the spill following exposure protocols

Formalin is a hazardous chemical; the first response is to don PPE (gloves, eye protection) and contain the spill per OSHA and facility exposure control protocols.

Question 51: Meissner's corpuscles are sensory receptors primarily located in which skin region?

Sebaceous glands
Hypodermis
Stratum corneum
Dermal papillae of hairless skin (Correct answer)

Correct answer: Dermal papillae of hairless skin

Meissner's corpuscles are encapsulated mechanoreceptors found in the dermal papillae of glabrous (hairless) skin, detecting light touch.

Question 52: Which feature of a pigmented lesion is most associated with a diagnosis of malignant melanoma using the ABCDE criteria?

Color that is uniform brown
Border that is well-defined and smooth
Diameter greater than 6mm (Correct answer)
Symmetric shape

Correct answer: Diameter greater than 6mm

A diameter greater than 6 mm (the size of a pencil eraser) is one of the ABCDE warning signs for melanoma, though early melanomas can be smaller.

Question 53: The 'burrow' is a characteristic primary lesion type associated with which condition?

Vitiligo
Herpes zoster
Psoriasis
Scabies (Correct answer)

Correct answer: Scabies

Burrows are tunnel-like linear tracks created by the Sarcoptes scabiei mite burrowing into the stratum corneum, pathognomonic for scabies.

Question 54: When a conflict arises between standard procedures and a unique situation in Topical Medication Administration, what should a CDT professional prioritize?

The preference of the client or stakeholder
The most cost-effective solution available
Safety and ethical obligations while seeking expert consultation (Correct answer)
Strict adherence to written procedures without exception

Correct answer: Safety and ethical obligations while seeking expert consultation

Safety and ethics always take priority in Topical Medication Administration. When standard procedures don't adequately address a unique situation, consulting with experienced colleagues or supervisors ensures both safety and professional standards are maintained.

Question 55: What instruction must be given to patients during the patch testing period?

Apply moisturizer to the test site daily
Remove patches if mild itching occurs
Avoid getting the patch test area wet (Correct answer)
Exercise vigorously to confirm adhesion

Correct answer: Avoid getting the patch test area wet

Patients must keep the patch test area dry throughout the testing period to prevent allergen chambers from loosening or becoming contaminated.

Question 56: The papillary dermis differs from the reticular dermis in that it contains:

Thick elastic fibers only
Loose connective tissue and capillary loops (Correct answer)
Adipocytes and large vessels
Densely packed Type I collagen bundles

Correct answer: Loose connective tissue and capillary loops

The papillary dermis is composed of loose connective tissue with capillary loops that nourish the avascular epidermis.

Question 57: Eccrine sweat glands open directly onto the skin surface and primarily serve to:

Regulate body temperature through evaporative cooling (Correct answer)
Secrete sebum
Produce pheromones
Produce milk in lactating women

Correct answer: Regulate body temperature through evaporative cooling

Eccrine glands secrete hypotonic sweat onto the skin surface where its evaporation dissipates heat and regulates core body temperature.

Question 58: During wound healing, which cells are primarily responsible for synthesizing new collagen in the dermis?

Fibroblasts (Correct answer)
Mast cells
Neutrophils
Keratinocytes

Correct answer: Fibroblasts

Fibroblasts are the primary dermal cells that synthesize and remodel collagen during the proliferative phase of wound healing.

Question 59: When a dermatology tech has a known latex allergy, the safest glove alternative is:

Nitrile gloves (Correct answer)
Vinyl gloves only
Powdered latex gloves
Double-gloving with standard latex

Correct answer: Nitrile gloves

Nitrile gloves provide reliable barrier protection and are the recommended latex-free alternative for individuals with latex allergies.

Question 60: A child presents with honey-colored crusts around the nose and mouth. What is the most likely diagnosis?

Impetigo (Correct answer)
Eczema herpeticum
Angular cheilitis
Perioral dermatitis

Correct answer: Impetigo

Impetigo classically presents with honey-colored (golden) crusts, most commonly around the nose and mouth in children.

Question 61: What is the name of the intercellular junctions that link adjacent keratinocytes in the stratum spinosum?

Desmosomes (Correct answer)
Hemidesmosomes
Tight junctions
Gap junctions

Correct answer: Desmosomes

Desmosomes are strong intercellular junctions composed of desmogleins and desmocollins that physically connect adjacent keratinocytes and provide structural integrity.

Question 62: In cosmetic practice, platelet-rich plasma (PRP) is derived from which blood component and is used to stimulate collagen and tissue regeneration?

White blood cells filtered from whole blood
Serum with immunoglobulins removed
Red blood cells concentrated by centrifugation
Plasma enriched with a high concentration of platelets and growth factors (Correct answer)

Correct answer: Plasma enriched with a high concentration of platelets and growth factors

PRP is autologous plasma concentrated with platelets that release growth factors (PDGF, TGF-β, VEGF) upon activation, stimulating collagen synthesis and wound healing.

Question 63: The primary cell type responsible for producing the extracellular matrix of the dermis is the:

Fibroblast (Correct answer)
Mast cell
Endothelial cell
Macrophage

Correct answer: Fibroblast

Fibroblasts synthesize the major components of the dermal extracellular matrix including collagen, elastin, and glycosaminoglycans.

Question 64: When assessing skin turgor in a patient, which site provides the most reliable assessment in elderly patients?

Anterior thigh
Dorsum of the hand
Forehead or chest (Correct answer)
Inner forearm

Correct answer: Forehead or chest

In elderly patients, the forehead or chest are preferred sites for turgor assessment because age-related loss of elasticity on the hands makes hand turgor unreliable.

Question 65: Prion diseases require which reprocessing method because they resist standard sterilization?

UV light exposure for 60 minutes
Ethylene oxide gas sterilization
Glutaraldehyde soaking for 30 minutes
Autoclave at 134°C for ≥18 minutes using a gravity cycle (Correct answer)

Correct answer: Autoclave at 134°C for ≥18 minutes using a gravity cycle

Prions are resistant to routine sterilization; extended high-temperature autoclave cycles (134°C, ≥18 min) are the recommended decontamination approach for reusable instruments.

Question 66: Topical corticosteroids at the patch test application site should be:

Used throughout testing to improve patient tolerance
Discontinued for at least 1–2 weeks before testing on that skin area (Correct answer)
Applied immediately before patch placement to prevent severe reactions
Applied only during the 48-hour waiting period for comfort

Correct answer: Discontinued for at least 1–2 weeks before testing on that skin area

Topical corticosteroids suppress the local immune response and can cause false-negative patch test results, so they must be stopped at least 1–2 weeks before testing in that area.

Question 67: Nodular melanoma is considered the most dangerous clinical subtype primarily because:

It always lacks pigmentation making it invisible
It is the most common subtype in the elderly
It always arises from a pre-existing dysplastic nevus
It grows vertically from the start with no radial growth phase (Correct answer)

Correct answer: It grows vertically from the start with no radial growth phase

Nodular melanoma lacks a radial growth phase and invades deeply from the outset, leading to greater Breslow thickness at diagnosis.

Question 68: What is the purpose of using an autoclave?

For drying instruments
For sterilization (Correct answer)
For sharpening blades
To cool metal tools

Correct answer: For sterilization

An autoclave uses high-pressure saturated steam to achieve sterilization, effectively killing all forms of microbial life, including bacteria, viruses, fungi, and spores. This method is crucial in healthcare settings for rendering instruments and equipment safe for reuse, preventing the transmission of infections.

Question 69: Phototesting (MED determination) measures the minimum erythema dose. This test is used to:

Assess skin cancer risk by pigmentation typing
Identify allergens causing contact dermatitis
Diagnose fungal scalp infections
Determine a patient's UV sensitivity threshold for phototherapy dosing (Correct answer)

Correct answer: Determine a patient's UV sensitivity threshold for phototherapy dosing

The MED test exposes skin to incremental UV doses to find the lowest dose causing perceptible erythema, guiding safe and effective phototherapy treatment initiation.

Question 70: Which standard of practice is MOST important for ensuring quality in Common Skin Conditions & Treatment?

Minimizing documentation to focus on practical work
Following evidence-based protocols while adapting to specific circumstances (Correct answer)
Using the most advanced technology available regardless of need
Strictly adhering to the same procedure in every situation

Correct answer: Following evidence-based protocols while adapting to specific circumstances

Evidence-based protocols provide a foundation of proven practices, but effective Certified Dermatology Tech professionals must also adapt their approach based on specific circumstances and individual case needs within Common Skin Conditions & Treatment.

Question 71: Which post-treatment instruction is critical following botulinum toxin injections to the forehead and glabella?

Avoid sunscreen for 24 hours to prevent neutralization of the toxin
Apply ice packs continuously for 48 hours
Massage the treated areas vigorously to distribute the toxin evenly
Avoid lying down for at least 4 hours to prevent toxin migration (Correct answer)

Correct answer: Avoid lying down for at least 4 hours to prevent toxin migration

Remaining upright for at least 4 hours after Botox injection helps prevent migration of the toxin to unintended muscle groups such as the levator palpebrae.

Question 72: What does patient-centered care involve?

Relying solely on medical advice
Respecting and involving the patient (Correct answer)
Ignoring emotional needs
Only technical performance

Correct answer: Respecting and involving the patient

Patient-centered care is an approach that prioritizes the patient's individual needs, preferences, and values in all clinical decisions. It involves actively listening to the patient, providing clear information, respecting their autonomy, and involving them as partners in their own care.

Question 73: A technician performing a patch test for contact allergy reads results at 48 and 96 hours. A '+' (weakly positive) reaction is characterized by:

Non-palpable erythema only
Spreading reaction beyond the patch site
Erythema, edema, and small papules (Correct answer)
Bullae formation with necrosis

Correct answer: Erythema, edema, and small papules

A single-plus patch test reaction shows erythema, edema, and small papules, indicating a mild allergic contact sensitization to the test allergen.

Question 74: A patient has a documented allergy to amide local anesthetics. Which alternative should the CDT report to the provider before preparing for a procedure?

Benzocaine (ester-type) (Correct answer)
Lidocaine
Bupivacaine
Mepivacaine

Correct answer: Benzocaine (ester-type)

Benzocaine is an ester-type local anesthetic and is structurally distinct from amide anesthetics (lidocaine, mepivacaine, bupivacaine), making it a potential alternative for patients with amide allergies.

Question 75: Which of the following is the best indicator that a fungal culture specimen from skin scrapings is adequate?

The container is filled completely
The sample has a foul odor
Scrapings contain visible scale from the active border of the lesion (Correct answer)
The scrapings are watery and translucent

Correct answer: Scrapings contain visible scale from the active border of the lesion

Adequate fungal culture specimens contain scale from the active, advancing border of a lesion where viable organisms are most concentrated.

Question 76: When instructing a patient to apply a topical medication to the periorbital area, which caution is most critical?

Use twice as much to ensure penetration
Avoid getting the medication into the eyes (Correct answer)
Apply only at bedtime to avoid light sensitivity
Cover with an occlusive dressing

Correct answer: Avoid getting the medication into the eyes

Periorbital application requires extreme caution to prevent medication from contacting the eyes, as many topical agents can cause serious ocular damage.

Question 77: A patient on isotretinoin (Accutane) therapy requests a microdermabrasion treatment. The tech should:

Perform the treatment using the lowest suction setting
Perform the treatment but avoid the perioral area
Wait 3 days after the patient's last dose
Defer the procedure and inform the physician — isotretinoin is a contraindication (Correct answer)

Correct answer: Defer the procedure and inform the physician — isotretinoin is a contraindication

Isotretinoin impairs skin healing and alters sebaceous gland function; most guidelines recommend waiting 6–12 months after discontinuation before ablative or resurfacing procedures.

Question 78: Which advice should a dermatology tech provide to a patient who wants to reduce the appearance of stretch marks (striae)?

Treatments like topical retinoids, pulsed dye laser, or microneedling can improve appearance, but complete elimination is unlikely (Correct answer)
Applying olive oil daily will cause stretch marks to disappear within a month
Stretch marks are surgical scars and can only be removed with excision
Deep tanning in the sun will camouflage stretch marks permanently

Correct answer: Treatments like topical retinoids, pulsed dye laser, or microneedling can improve appearance, but complete elimination is unlikely

Various treatments can fade and improve stretch mark appearance, but patients should understand results are improvement, not full removal.

Question 79: Which tool is commonly used during a skin biopsy?

Cotton swab
Forceps
Scalpel blade
Punch biopsy instrument (Correct answer)

Correct answer: Punch biopsy instrument

A punch biopsy instrument is a specialized circular blade used to remove a small, cylindrical core of skin tissue for diagnostic examination. This tool allows for a full-thickness sample of the epidermis, dermis, and sometimes subcutaneous fat, which is crucial for accurate diagnosis of many skin conditions.

Question 80: A patient presents with pruritic papules and burrows between the finger webs and on the wrists. What is the most likely diagnosis?

Lichen planus
Scabies (Correct answer)
Atopic dermatitis
Contact dermatitis

Correct answer: Scabies

Scabies, caused by Sarcoptes scabiei mite infestation, characteristically presents with intensely pruritic papules and linear burrows in web spaces, wrists, and genitalia.

Question 81: When using dermoscopy to evaluate a pigmented lesion, which feature is most associated with melanoma?

Milia-like cysts
Atypical pigment network with regression structures (Correct answer)
Leaf-like areas of brown pigment
Comma-shaped vessels

Correct answer: Atypical pigment network with regression structures

Atypical pigment network combined with regression structures (white scar-like areas or blue-gray peppering) is a key dermoscopic indicator of melanoma.

Question 82: Apocrine sweat glands are primarily located in which body areas?

Axillae and groin (Correct answer)
Palms and soles
Forehead and upper lip
Back and chest

Correct answer: Axillae and groin

Apocrine glands are concentrated in the axillae, groin, and areolae, becoming active after puberty and producing a thicker secretion associated with body odor.

Question 83: The Langerhans cells found in the epidermis function primarily as:

Melanin producers
Keratin synthesizers
Tactile receptors
Antigen-presenting immune cells (Correct answer)

Correct answer: Antigen-presenting immune cells

Langerhans cells are dendritic antigen-presenting cells that play a key role in the skin's immune surveillance.

Question 84: When a patient asks about the difference between a benign seborrheic keratosis and a potentially dangerous lesion, the best educational point is:

Any raised brown lesion is a seborrheic keratosis and does not require evaluation
Seborrheic keratoses are caused by UV exposure and require removal
Seborrheic keratoses have a 'stuck-on,' waxy, warty appearance and are not pre-cancerous (Correct answer)
Seborrheic keratoses always appear before age 30

Correct answer: Seborrheic keratoses have a 'stuck-on,' waxy, warty appearance and are not pre-cancerous

Seborrheic keratoses have a characteristic stuck-on, waxy appearance and sharply defined borders; they are benign and not pre-malignant.

Question 85: Breslow thickness in melanoma staging measures:

Degree of lymphovascular invasion
Vertical depth of tumor invasion from the granular layer in millimeters (Correct answer)
Number of mitoses per high-power field
Horizontal diameter of the tumor in millimeters

Correct answer: Vertical depth of tumor invasion from the granular layer in millimeters

Breslow thickness is the vertical depth of melanoma invasion measured in millimeters from the epidermal granular layer to the deepest tumor cell.

Question 86: Which regulatory body classifies laser and light-based devices used in dermatology as medical devices requiring FDA clearance or approval in the United States?

Federal Trade Commission (FTC)
Drug Enforcement Administration (DEA)
Food and Drug Administration (FDA) (Correct answer)
Occupational Safety and Health Administration (OSHA)

Correct answer: Food and Drug Administration (FDA)

The FDA Center for Devices and Radiological Health (CDRH) regulates laser and energy-based aesthetic devices, requiring 510(k) clearance or PMA approval before marketing.

Question 87: What is a key component of ethical patient care?

Asking family to decide
Obtaining informed consent (Correct answer)
Rushing patients through procedures
Skipping documentation

Correct answer: Obtaining informed consent

Informed consent is a cornerstone of ethical patient care, ensuring that patients understand their medical condition, proposed treatments, potential risks, benefits, and alternatives before agreeing to any procedure. This process respects patient autonomy and their right to make informed decisions about their own healthcare.

Question 88: When is the final reading of a patch test typically performed?

48 hours after application
24 hours after application
72–96 hours after application (Correct answer)
7 days after application

Correct answer: 72–96 hours after application

The final reading is performed at 72–96 hours to allow differentiation between true allergic and irritant reactions that may look similar at 48 hours.

Question 89: In which setting would a CDT most appropriately perform a skin cancer screening using a structured exam protocol?

Ordering and interpreting dermoscopy images autonomously
Independently diagnosing lesions without physician supervision
Assisting the dermatologist during a full-body skin exam and documenting findings (Correct answer)
Performing shave biopsies to expedite patient flow

Correct answer: Assisting the dermatologist during a full-body skin exam and documenting findings

CDTs work under physician supervision, assisting with systematic exams, positioning patients, and accurately documenting lesion characteristics.

Question 90: Which treatment modality uses focused ultraviolet B light to treat localized skin conditions like psoriasis and vitiligo?

IPL (intense pulsed light)
Excimer laser therapy (Correct answer)
PUVA therapy
Narrowband UVB phototherapy

Correct answer: Excimer laser therapy

The excimer laser delivers a focused 308-nm UVB beam, allowing targeted treatment of localized plaques without irradiating surrounding healthy skin.

Question 91: A gel formulation is typically preferred over an ointment for acne-prone areas because gels:

Have a higher drug concentration
Are more stable at room temperature
Penetrate deeper into the dermis
Are water-based and less likely to clog pores (Correct answer)

Correct answer: Are water-based and less likely to clog pores

Gels are typically water- or alcohol-based, making them non-comedogenic and preferable for acne-prone or oily skin where ointments could clog pores.

Question 92: Which PPE item is considered the FIRST line of defense against contact transmission in a dermatology setting?

Gloves (Correct answer)
Face shield
N95 respirator
Gown

Correct answer: Gloves

Gloves are the primary barrier against contact transmission and must be worn when touching patients or potentially contaminated surfaces.

Question 93: A patient undergoing laser hair removal asks how many sessions are typically needed. The dermatology tech should explain that multiple sessions are required because:

Laser only destroys hair follicles in the active (anagen) growth phase (Correct answer)
The laser can only treat one follicle at a time
Hair regrows faster after laser treatment
Each session reduces pain tolerance, requiring longer intervals

Correct answer: Laser only destroys hair follicles in the active (anagen) growth phase

Laser hair removal targets the pigment in actively growing (anagen) follicles, and since follicles cycle asynchronously, multiple sessions are needed.

Question 94: Which type of wound closure involves placing sutures or staples to reapproximate wound edges immediately after injury?

Healing by tertiary intention
Primary intention closure (Correct answer)
Healing by secondary intention
Delayed primary closure

Correct answer: Primary intention closure

Primary intention closure involves immediate surgical closure of clean wound edges, resulting in minimal scarring.

Question 95: Which of the following is a contraindication for patch testing?

Active widespread dermatitis on the upper back (Correct answer)
History of atopic dermatitis
Patient age over 60 years
Previous positive patch test result

Correct answer: Active widespread dermatitis on the upper back

Active widespread dermatitis on the upper back prevents proper placement of test chambers and accurate interpretation of results.

Question 96: The correct order for donning PPE before a dermatology procedure is:

Mask → gloves → gown → eye protection
Eye protection → gloves → gown → mask
Gloves → gown → mask → eye protection
Gown → mask/respirator → eye protection → gloves (Correct answer)

Correct answer: Gown → mask/respirator → eye protection → gloves

CDC guidance specifies gown first, then mask/respirator, then eye protection, then gloves to ensure the outer garment is secured before adding other protective items.

Question 97: Which assessment finding would prompt a dermatology technician to classify a pressure injury as Stage 4?

Unstageable due to wound covered with eschar
Full thickness skin loss with exposed or palpable fascia, muscle, or bone (Correct answer)
Partial thickness skin loss with exposed dermis
Intact skin with non-blanchable erythema

Correct answer: Full thickness skin loss with exposed or palpable fascia, muscle, or bone

Stage 4 pressure injuries involve full-thickness tissue loss exposing underlying structures such as fascia, muscle, tendon, ligament, cartilage, or bone.

Question 98: A patient presents with a nodule on the ear. The dermatologist requests an incisional biopsy. What does this technique involve?

Using a hollow punch to remove a core sample
Scraping the surface of the lesion
Removal of only a representative portion of the lesion (Correct answer)
Removal of the entire lesion with clear margins

Correct answer: Removal of only a representative portion of the lesion

An incisional biopsy removes only part of a larger lesion for diagnosis when complete excision is not practical or necessary at the initial visit.

Question 99: A newborn presents with a large, superficial blister that ruptures easily, leaving a moist denuded area. Gram stain shows gram-positive cocci in clusters. What is the most likely diagnosis?

Pemphigus vulgaris
Staphylococcal scalded skin syndrome (Correct answer)
Bullous impetigo
Epidermolysis bullosa

Correct answer: Staphylococcal scalded skin syndrome

Staphylococcal scalded skin syndrome in neonates is caused by exfoliative toxins from Staphylococcus aureus, causing widespread superficial blistering and desquamation.

Question 100: Total body photography (TBP) is used in high-risk patients primarily to:

Calculate the total number of nevi automatically
Serve as a baseline reference to detect new or changing lesions over time (Correct answer)
Replace annual biopsy surveillance
Screen for internal melanoma metastases

Correct answer: Serve as a baseline reference to detect new or changing lesions over time

TBP creates a photographic baseline of all lesions, enabling clinicians to detect subtle new or morphologically changing lesions at follow-up visits.

Certified Dermatology Tech (CDT)

The CDT certification, offered by the Association of Certified Dermatology Techs (ACDT), validates the knowledge and skills of dermatology clinical staff across two levels: Level I covering essentials such as skin anatomy, medications, and infection control, and Level II covering advanced topics including skin conditions, lab procedures, and cosmetic dermatology.

100

Questions

90 min

Time Limit

75%

To Pass

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