A 78-year-old male with painful erythematous skin lesions on the lower extremity

摘要

A 78-year-old farmer with a history of diabetes mellitus and rheumatoid arthritis, well controlled with metformin and prednisone 20?mg daily, respectively, presented with erythematous nodular skin lesions over the back of his right thigh of 1-week duration. He had not had any opportunistic infection previously. Two of the lesions were cystic and were aspirated. Fluid culture grew Mycobacterium chelonae. The patient was negative for HIV antibody (Figs. 1–3).