REPORT OF A CASE
A 40-year-old homosexual man was referred to the dermatology department because of a widespread eruption that had appeared 4 weeks before and that had spread rapidly. The lesions were not pruritic and he was otherwise well. He denied any sexual activity for 4 years.Examination showed several dark-purple, smooth surfaced, nontender, grouped nodules and plaques on the arm, wrists, and knees (Figs 1 and 2) and isolated papules on the shaft of the penis. The lesions ranged from 0.5 to 3 cm in diameter. No mucosal lesions or lymphadenopathy was seen. The rest of the examination showed normal findings.A skin biopsy specimen was obtained from one of the nodules (Fig 3).What is your diagnosis?
The biopsy specimen showed a dense inflammatory infiltrate in the middermis and the upper dermis with several mononuclear cells
Adriaans B. An Erythematous Nodular Eruption. Arch Dermatol. 1992;128(7):981-982. doi:10.1001/archderm.1992.01680170113020