Dermatologist Certificate Dermatologist Certificate MCQ 2

Question 1

A 45-year-old presents with a scaly, erythematous plaque with silver scale on the extensor surface of the elbow. The Auspitz sign is positive. What is the most likely diagnosis?

Accepted Answer

Psoriasis vulgaris

Answer

Auspitz sign (pinpoint bleeding when scale is removed) is characteristic of psoriasis vulgaris, commonly found on extensor surfaces.

Question 2

Which dermatophyte species is the most common cause of tinea capitis in the United States?

Accepted Answer

Trichophyton tonsurans

Answer

Trichophyton tonsurans is the predominant cause of tinea capitis in the US, especially in African American children.

Question 3

A newborn presents with vesicles and pustules on an erythematous base distributed over the trunk, face, and extremities. Smear shows eosinophils. What is the diagnosis?

Accepted Answer

Erythema toxicum neonatorum

Answer

Erythema toxicum neonatorum is a benign self-limiting eruption in newborns characterized by eosinophils on smear.

Question 4

Which layer of the epidermis contains the highest concentration of melanocytes?

Accepted Answer

Stratum basale

Answer

Melanocytes reside primarily in the stratum basale (basal layer), where they transfer melanin to surrounding keratinocytes.

Question 5

A patient taking methotrexate for psoriasis develops oral ulcers and cytopenias. Which supplement should be co-administered to reduce toxicity?

Accepted Answer

Folic acid

Answer

Folic acid supplementation reduces methotrexate-related side effects including mucositis and bone marrow suppression without significantly reducing efficacy.

Dermatologist Certificate Practice Test

Dermatologist Certificate Practice Test

Dermatologist Certificate Dermatologist Certificate MCQ 2