The phenyl-substituted analog of prostaglandin F 2alpha , latanoprost (Xalatan; Pfizer, Inc, New York, NY) is an intraocular pressure (IOP)-lowering drug for use in patients with glaucoma and ocular hypertension. Latanoprost has been shown to stimulate eyelash hypertrichosis and has recently been proposed as a possible treatment for alopecia areata involving the eyelashes. We report a case of hypertrichosis of the eyelashes caused by the prostamide bimatoprost (Lumigan; Allergan, Inc, Irvine, Calif), a new IOP-lowering drug.