Melanonychiahttps://en.wikipedia.org/wiki/Melanonychia
Melanonychia is in swarte of brune pigmentaasje fan de normale nagelplaat, en kin oanwêzich wêze as in normale fynst op in protte sifers yn Afro‑Karibyske minsken.

In brede, djippe pigmentearre baan mei ûnregelmjittige linnen en pigmentearre útwreiding op de periunguale weefsels is in teken fan melanoma.

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  • Ungewoane meardere rigels binne waarnommen. Melanonychia is meast goedaardige, mar as der in protte ûnregelmjittige rigels op dit nivo binne, kin in biopsie beskôge wurde.
  • Muehrcke's lines
  • Bruine bân
References Melanonychia: Etiology, Diagnosis, and Treatment 32055501 
NIH
In protte pasjinten hawwe melanonychia, wêrtroch't in brúnich-swarte ferkleuring fan 'e nagelplaat optreedt. It is in faak reden foar ferkleuring fan nagels, mei oarsaken dy't fariearje fan goedaardige oant potinsjeel serieuze, lykas melanomen. Longitudinale band-lykwurde melanonychia kin komme troch ferskate lokale of systemyske faktoaren.
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.