Melanonychiahttps://en.wikipedia.org/wiki/Melanonychia
Melanonychia se yon pigmantasyon nwa oswa mawon sou plak klou nòmal la, epi li ka parèt kòm yon varyasyon nòmal sou anpil moun Afro‑Karayib yo.

Yon bann lajè, ki pwofondman pigmantè, ak liy iregilye ki gen ekstansyon pigman sou tisi periungual yo se yon siy melanom.

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  • Liy miltip etranj yo obsève. Melanonychia se sitou benign, men si gen anpil liy iregilye nan nivo sa a, yo dwe konsidere yon byopsi.
  • Muehrcke's lines
  • Brown banding
References Melanonychia: Etiology, Diagnosis, and Treatment 32055501 
NIH
Anpil pasyan jwenn melanonychia, ki lakòz dekolorasyon mawon‑nwa sou plak klou a. Li se yon koz souvan pou dekolorasyon klou, ki ka soti nan kondisyon ki benign oswa potansyèlman grav, tankou melanom. Melanonychia longitudinal ki sanble ak bann ka soti nan plizyè faktè lokal oswa sistemik.
Melanonychia is a very worrisome entity for most patients. It is characterized by brownish black discoloration of nail plate and is a common cause of nail plate pigmentation. The aetiology of melanonychia ranges from more common benign causes to less common invasive and in situ melanomas. Melanonychia especially in a longitudinal band form can be due to both local and systemic causes.
 Melanonychia – Clues for a Correct Diagnosis 32064201 
NIH
Melanonychia represents a brown to black discoloration of the nail plate that may be induced by benign or malignant causes. Two main mechanisms are involved in the appearance of melanonychias, i.e., melanocytic activation and melanocytic hyperplasia.