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a congenital autosomal dominant pigmentary disorder of the skin due to absence of functioning melanocytes and melanin, resulting in patchy areas of depigmentation or hypopigmentation, often occurring in association with white forelock.
Patchy absence of the pigment of scalp hair, giving a streaked appearance; patches of vitiligo may be present in other areas due to absence of melanocytes; often transmitted as an autosomal dominant trait caused by mutation in the KIT protooncogene on 4q and may be associated with neurologic defects [MIM*172850] or eye changes [MIM*172870]. Compare: Waardenburg syndrome.
2. Partial ALBINISM.
3. A rare hereditary disease in which there are patchy areas of skin with no pigment.