<unk>  is an extremely rare genetic disorder that prevents the development of fingerprints. Five extended families worldwide are known to be affected by this condition. The disorder was informally nicknamed "immigration delay disease" by Professor Peter Itin after his first patient had trouble traveling to the U.S. without any fingerprints for identification. __TOC__
Adermatoglyphia
Necrospermia
Onychogryphosis
Koilonychia
Melanonychia
Trachonychia
Platonychia
Onychophosis