A person came with a unilateral white skin lesion with leukotrichia. Diagnosis is
Piebaldism is a rare autosomal dominant trait characterized by well-demarcated hypopigmented macules The most typical and common clinical picture is a white forelock often associated with a V-shaped area of leukoderma on mid-forehead Mostly seen over the anterior poion of the limbs, seen on the face paicularly on the chinLesions can be bilateral but not always symmetrical Other features: inter-pupillary distance is increased (Ref: Rook's page 1856 chapter 70.30)
Segmental vitiligo
Piebaldism
Albinism
Nevus achromicus
Autoimmune skin disorders