Melanonychiahttps://en.wikipedia.org/wiki/Melanonychia
Melanonychia nyaéta pigméntasi hideung atawa coklat dina piring kuku normal, sarta bisa muncul sacara normal dina loba digit jalma Afro‑Karibia.

Pita anu lega, pigmén jero kalayan garis anu teu teratur, sarta ékstensi pigmén kana jaringan periungual, mangrupikeun tanda melanoma.

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  • Teu biasa ningali sababaraha garis. Melanonychia biasana jinak, tapi upami aya seueur garis anu teu teratur dina tingkat ieu, biopsi tiasa dipertimbangkeun.
  • Muehrcke's lines
  • Brown banding
References Melanonychia: Etiology, Diagnosis, and Treatment 32055501 
NIH
Seueur pasien ngalaman melanonychia, anu nyababkeun warna coklat‑hideung dina piring kuku. Ieu mangrupikeun alesan umum pikeun robahna warna kuku, kalayan panyababna ti anu jinak nepi ka anu poténsial serius, sapertos melanoma. Melanonychia anu muncul salaku pita longitudinal tiasa disababkeun ku sababaraha faktor lokal atawa 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.