Ainhum

A narrow strip of hardened skin, a constricting ring, forms on the little toe at the level of the digitoplantar fold and progresses to spontaneous amputation of the digit. Familial occurrence has been noted by Maass (1926) and by DaSilva Lima (1880). Simon (1921) reported ainhum in father and 2 sons. Ainhum-like constriction bands occur with neurogenic acroosteolysis (201300) and with mutilating keratoderma (124500, 244850).