Case 1

A 24-year-old woman presents to the clinic with a 4-month history of an erythematous annular lesion on the dorsal arm. The lesion is neither painful nor pruritic, and the patient reports no associated symptoms. The lesion measures 2 cm and is composed of 3-mm papules. The patient reports that the lesion has slowly expanded over time. She has not tried any topical medications. She is healthy and has no chronic medical conditions.

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Can you diagnose the condition in Case 1?

A. Tinea corporis

B. Granuloma annulare

C. Annular elastolytic giant cell granuloma

D. Primary cutaneous B-cell lymphoma

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