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Psoriasis — MCCQE Part 1 MCQ

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EasyRashPsoriasisMCCQE Part 1

A 42-year-old man has well-demarcated erythematous plaques with silvery scale on the elbows, knees and scalp. Nail pitting is present. Which of the following is the most likely diagnosis?

Educational content. Not a substitute for clinical judgement or local policy.

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Correct answer: C — Plaque psoriasis

Extensor plaques with silvery scale and nail pitting are typical plaque psoriasis. Atopic dermatitis is usually flexural and intensely pruritic, while tinea has annular lesions with central clearing. Psoriatic arthritis screening is important because joint disease may be missed.

Reference: Canadian Dermatology Association psoriasis resources