Pigmentary correction of piebaldism by autografts. II. Pathomechanism and pigment spread in piebaldism.

Human piebaldism is an expression of neural crest component abnormality that is classically inherited dominantly and is probably heterogeneous genetically. Though usually a stable cutaneous condition, spontaneous pigmentation in hypomelanotic tracts is known. Here, pigmented skin around the axilla was transplanted to hypomelanotic areas in two patients with piebaldism.

Black-hair follicular dysplasia in dogs.

Black-hair follicular dysplasia in dogs of mixed breeding was delineated by hypotrichosis and dullness of most black regions of the coat. White regions remained full and lustrous. The abnormality was not grossly visible at birth but became evident after the 1st month of life.