<prompt> Piebaldism refers toAndrogenetic alopeciaErythema nodosum leprosumAssociated with white forelockNone of the above  <response>: Piebaldism is a hypopigmented disorder which is present since birth and is characterized by congenital white forelock and hypopigmented or depigmented macules on the central part of the forehead, ventral trunk, and upper lower extremities. Involvement is bilaterally symmetrical. 