Endometriosis is a commonly encountered benign gynecological disease, involving extrauterine growth of both endometrial glands and elements of endometrial stroma. The vulva is not exempt from endometriotic disease. However rare, endometriosis may occur in the Bartholin gland, in episiotomy scars, postoperative perineal incision sites and vulvar lacerations. Risk factors for vulvar endometriosis include prior perineal surgery and parity. The following case presents a patient with a localised vulvar lesion, mistaken for a Bartholin cyst, treated with complete excision, later to be identified as a vulvar endometrioma.