CDT Cosmetic Dermatology Assistance 3 — Questions and Answers
Question 1: What is the primary purpose of applying a coupling gel during an ultrasound-based skin tightening procedure such as Ultherapy?
- To anesthetize the skin surface
- To facilitate ultrasound wave transmission and skin contact (Correct answer)
- To prevent post-procedure hyperpigmentation
- To dilute the ultrasound energy for safety
Correct answer: To facilitate ultrasound wave transmission and skin contact
Coupling gel eliminates air gaps between the transducer and skin, allowing efficient ultrasound energy transmission to the target tissue depth.
Question 2: When documenting pre-treatment photographs for a cosmetic dermatology procedure, which standardized lighting condition is preferred for consistency?
- Natural window light
- Fluorescent overhead lighting
- Standardized studio lighting at consistent angles (Correct answer)
- Flash-only smartphone photography
Correct answer: Standardized studio lighting at consistent angles
Standardized studio lighting at consistent angles ensures reproducible images that allow accurate before-and-after comparisons.
Question 3: Which filler material is considered reversible because it can be dissolved with hyaluronidase if a vascular complication is suspected?
- Poly-L-lactic acid (Sculptra)
- Calcium hydroxylapatite (Radiesse)
- Hyaluronic acid (Juvederm, Restylane) (Correct answer)
- Polymethylmethacrylate (Bellafill)
Correct answer: Hyaluronic acid (Juvederm, Restylane)
Hyaluronic acid fillers are uniquely reversible because hyaluronidase can rapidly dissolve them, making them the preferred first-line filler for most cosmetic indications.
Question 4: A patient develops a Tyndall effect after hyaluronic acid filler injection to the tear trough. What does this bluish discoloration indicate?
- Allergic reaction to the filler
- Infection at the injection site
- Superficial placement of filler causing light scattering (Correct answer)
- Vascular occlusion
Correct answer: Superficial placement of filler causing light scattering
The Tyndall effect occurs when HA filler is placed too superficially in thin periorbital skin, causing blue-gray discoloration from light scattering.
Question 5: Which skin type on the Fitzpatrick scale has the highest risk of post-procedure hyperpigmentation following ablative laser treatments?
- Type I
- Type II
- Type III
- Types V–VI (Correct answer)
Correct answer: Types V–VI
Fitzpatrick types V and VI have greater baseline melanin and a higher density of reactive melanocytes, making post-inflammatory hyperpigmentation a significant risk after ablative lasers.
Question 6: Before assisting with sclerotherapy for spider veins, the tech should verify which essential baseline measurement?
- Intraocular pressure
- Ankle-brachial index or venous Doppler study results if indicated (Correct answer)
- Capillary refill time of the fingers
- Lymph node palpation results
Correct answer: Ankle-brachial index or venous Doppler study results if indicated
Venous studies help rule out underlying venous insufficiency, which must be addressed before sclerotherapy to avoid treatment failure or complications.
Question 7: A patient undergoing cryotherapy for seborrheic keratoses asks why the lesion will darken before it falls off. Which is the best explanation?
- The liquid nitrogen reacts with melanin to create temporary pigment
- Cellular destruction causes post-inflammatory discoloration as the lesion crusts and separates (Correct answer)
- The cold stimulates new collagen that pushes the lesion up
- Nitrogen gas trapped in the lesion oxidizes to cause darkening
Correct answer: Cellular destruction causes post-inflammatory discoloration as the lesion crusts and separates
After cryotherapy, treated cells undergo necrosis and the lesion forms a crust, appearing darker before naturally sloughing off over 1–4 weeks.
CDT Cosmetic Dermatology Assistance 3
What is the primary purpose of applying a coupling gel during an ultrasound-based skin tightening procedure such as Ultherapy?