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Onychoschizia is a splitting of the distal nail plate into layers at the free edge, a very common problem among women and represents a dyshesion of the layers of keratin, possibly as a result of dehydration.[1][2] It usually occurs in children under 16. It also occurs in hooved animals such as horses[3] and responds favorably to treatment with vitamin B7, also known as biotin.[3]

See also[edit]


  1. ^ James, William; Berger, Timothy; Elston, Dirk (2005). Andrews' Diseases of the Skin: Clinical Dermatology (10th ed.). Saunders. p. 786. ISBN 0-7216-2921-0.
  2. ^ Rapini, Ronald P.; Bolognia, Jean L.; Jorizzo, Joseph L. (2007). Dermatology: 2-Volume Set. St. Louis: Mosby. ISBN 978-1-4160-2999-1.[page needed]
  3. ^ a b Colombo, Victor E.; Gerber, Françoise; Bronhofer, Max; Floersheim, George L. (December 1990). "Treatment of brittle fingernails and onychoschizia with biotin: Scanning electron microscopy". Journal of the American Academy of Dermatology. 23 (6): 1127–1132. doi:10.1016/0190-9622(90)70345-i. PMID 2273113.