A man in his 60s presented with a slowly enlarging, painful mass on his buttock. He recalled that a small lesion had appeared approximately 8 months prior, and over the past several months he had noted significant growth and pain. A nonpruritic rash had also become apparent on his forearms and thighs. Physical examination showed a 2-cm macerated pedunculated growth on the left buttock within the intergluteal cleft (Figure, A). An erythematous rash was noted on the forearms and thighs with fine scale present at the wrists.
Mosojane KI, Lee LW, Kovarik CL. Eroded and Pedunculated Buttock Nodule. JAMA Dermatol. 2015;151(3):335-336. doi:10.1001/jamadermatol.2014.3238