Piebaldism refers to:

Piebaldism Rare AD disorder of melanocyte development characterized by congenital white forelock and multiple symmetrical hypopigmented or depigmented macules. Etiology: Absence of melanocytes in affected skin and hair follicles as a result of mutations of the KIT proto-oncogene. Symmetric involvement of central forehead, ventral trunk, and mid regions of upper and lower extremities. Idiopathic Guttate Hypomelanosis (IGH) is a benign and asymptomatic skin manifestation characterized as diffuse hypopigmented macules, or white spots.