A 14-year-old African American girl with a history of mild atopic dermatitis presented to the outpatient dermatology clinic for evaluation of light spots on her arms and legs. The lesions had been present for approximately 3 months and were asymptomatic. She was otherwise healthy without a history of fevers or weight loss.Physical examination revealed numerous 1 to 1.5 centimeter hypopigmented macules and patches on the extremities, with sparing of the face and trunk (Fig. 1). No lymphadenopathy was appreciated. Initially, the lesions were felt to be potentially consistent with postinflammatory hypopigmentation; however, the patient denied any preceding skin eruption or flare of her atopic dermatitis. She was instructed to moisturize her skin with white petrolatum daily and use sunscreen.The lesions remained unchanged when she returned for follow-up; therefore, a skin biopsy was performed (Fig. 2).