CDT Dermatologic Conditions & Diseases 2

Question 1

A patient presents with well-demarcated, erythematous plaques covered with silvery-white scales on the elbows and knees. Which condition is most likely?

Accepted Answer

Psoriasis vulgaris

Answer

Psoriasis vulgaris characteristically presents with well-demarcated erythematous plaques with silvery-white scales on extensor surfaces like elbows and knees.

Question 2

Which dermatophyte infection specifically affects the nails?

Accepted Answer

Onychomycosis

Answer

Onychomycosis is fungal infection of the nails, causing thickening, discoloration, and brittleness.

Question 3

A 65-year-old with a history of sun exposure presents with a rough, scaly lesion on the face. Biopsy reveals atypical keratinocytes in the epidermis without invasion. What is the diagnosis?

Accepted Answer

Actinic keratosis

Answer

Actinic keratosis (solar keratosis) shows atypical keratinocytes confined to the epidermis, making it a precancerous lesion rather than frank carcinoma.

Question 4

Which type of urticaria is caused by physical stimuli such as pressure, cold, or heat?

Accepted Answer

Physical urticaria

Answer

Physical urticaria is triggered by external physical stimuli including cold, heat, pressure, vibration, or exercise.

Question 5

Stevens-Johnson syndrome (SJS) is best described as:

Accepted Answer

A severe mucocutaneous drug reaction with epidermal detachment affecting less than 10% BSA

Answer

SJS is a severe mucocutaneous hypersensitivity reaction, most often drug-induced, characterized by epidermal detachment involving less than 10% of body surface area.

(CDT) Certified Dermatology Tech Practice Test

(CDT) Certified Dermatology Tech Practice Test

CDT Dermatologic Conditions & Diseases 2