Differential diagnosis includes postinflammatory hypopigmentation, piebaldism (a rare autosomal dominant disorder in which depigmented patches surrounded by hyperpigmented areas occur most often on the forehead, neck, anterior trunk, and mid-extremities), morphea (localized scleroderma, in which skin is usually sclerotic), leprosy (in which lesions are usually hypoesthetic), lichen sclerosus, pityriasis alba, chemical leukoderma, and leukoderma due to melanoma.