Cutaneous and subcutaneous endometriosis occurs most commonly as a secondary process in scars after abdominal or pelvic surgical procedures including hysterectomy, cesarean sections and episiotomy. Simple excision is the recommended management and local recurrence after adequate excision is uncommon. A 32-year-old woman presented with a 5-cm firm tumor on the right perineum. There was cyclical bleeding and fluctuation in size. She was initially treated with subcutaneous goserelin acetate. The lesion decreased in size and was then successfully excised 4 months later.