Idiopathic Unilateral Facial Hirsutism

Hirsutism is the growth of terminal hair in a female in a male-like distribution. Idiopathic hirsutism (IH) is when there is no increase in circulating androgens or ovarian hormones. IH usually involves multiple sites with variable densities. Localized and unilateral dermatomal hirsutism has been rarely described. We report a forty-year-old female with a history of terminal hair growth on the left side of the chin. There was no associated biochemical or ultrasonic evidence of hyperandrogenism suggesting it to be idiopathic.