List the disorders that should be considered in this patient Answer

a. Pityriasis rosea.

b. Pityriasis rosea-like drug eruption.

c. Seborrheic dermatitis.

d. Early eruptive psoriasis.

e. Secondary syphilis.

f. Nummular eczema.

2. Is tinea corporis still part of the differential diagnosis, and if not, why not? Answer: Tinea corporis enters the differential diagnosis when single or small numbers of lesions are present; however, tinea corporis does not spread at this rate and does not produce large numbers of individual lesions. Also, topical antifungal agents are usually effective over a 2-week treatment period.

A negative KOH preparation would have ruled out tinea corporis at the time of the initial visit and prevented unnecessary antifungal therapy.

3. What are the primary lesions of pityriasis rosea? Answer: Rosy-red papules and rosy-red plaques.

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