A 76-year-old man presented with a 1-year history of an asymptomatic mass in his pubic region. The lesion began as an erythema that ulcerated and rapidly progressed into a protruding mass. For past medical history, he had prostatic hyperplasia and underwent transurethral resection of bladder cancer (T1N0M0) 2 months previously. Physical examination revealed a well-demarcated erythematous