An umbilical bleeding nodule

Primary cutaneous endometriosis is the presence of ectopic endometrial tissue in the umbilical area without history of surgery.Cutaneous endometriosis should be suspected in case of swelling, tenderness and discharge of any umbilical mass concomitant with the menstrual cycles. A detailed clinical history is crucial for an accurate diagnosis. A complete excision and histological con rmation is the treatment of choice.