Description : Piebaldism is a rare autosomal dominant trait characterized by the congenital absence
of melanocytes in affected areas of the skin and hair. A white forelock of hair, often
triangular in shape, may be the only manifestation, or both the hair and the underlying
forehead may be involved. The eyebrows and eyelashes may be affected. Irregularly
shaped white patches may be observed on the face, trunk, and extremities, usually
in a symmetrical distribution. Typically, islands of hyperpigmentation are present
within and at the border of depigmented areas (summary by Thomas et al., 2004).;