Melanonychia is a black or brown pigmentation of a nail, and may be present as a normal finding on many digits in Afro-Caribbeans, as a result of trauma, systemic disease, or medications, or as a postinflammatory event from such localized events as lichen planus or fixed drug eruption.[1]: 790 [2]: 665 

There are two types, longitudinal and transverse melanonychia.[2]: 671  Longitudinal melanonychia may be a sign of subungual melanoma (a manifestation of acral lentiginous melanoma in nails[3]),[4] although there are other diagnoses such as chronic paronychia, onychomycosis, subungual hematoma, pyogenic granuloma, glomus tumour, subungual verruca, mucous cyst, subungual fibroma, keratoacanthoma, carcinoma of the nail bed, and subungual exostosis.

See also

References

  1. ↑ James, William; Berger, Timothy; Elston, Dirk (2005). Andrews' Diseases of the Skin: Clinical Dermatology. (10th ed.). Saunders. ISBN 0-7216-2921-0.
  2. 1 2 Freedberg, et al. (2003). Fitzpatrick's Dermatology in General Medicine. (6th ed.). McGraw-Hill. ISBN 0-07-138076-0.
  3. ↑ Guarneri, Claudio; Valenti, Giancarlo (December 2008). "Answer to Dermacase continued from page 1697: Amelanotic subungual melanoma". Canadian Family Physician. 54 (12): 1698. PMC 2602635.
  4. ↑ Baran, Robert, et al. 2008. Baran & Dawber's Diseases of the Nails and Their Management. Oxford: Blackwell, p. 516.
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