A 48-YEAR-OLD WOMAN presented to Dermatology for evaluation of a 6-cm abdominal lesion that had been present for 5 weeks (FIGURE 1). The lesion was originally about the size of a quarter, but it started to enlarge after treatment of an asthma exacerbation with a 4-day course of prednisone. It continued to grow after another physician, likely presuming the lesion was a corticosteroid-responsive dermatosis (eg, nummular eczema, granuloma annulare, or erythema annulare centrifugum), prescribed a 2-week trial of clobetasol ointment. Physical examination revealed a mildly pruritic, 6-cm erythematous plaque with scaly, annular, concentric rings on the left lower abdomen. The patient had no travel history.
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