A 17-year old female patient with extragenital lichen sclerosus et atrophicus was treated with the pulsed dye laser. Local and systemic therapy before treatment showed no effect. The lesions were removed completely with four treatment sessions. As for side effects, no pigment changes and no visible scarring was observed. The patient experienced no recurrence within a follow-up time of 7 months. The mechanism whereby lichen sclerosus et atrophicus is altered by the pulsed dye laser is unknown.