Melanonychiahttps://en.wikipedia.org/wiki/Melanonychia
Melanonychia ni rangi nyeusi au kahawia ya gamba la kawaida la kucha, na inaweza kuwa kama matokeo ya kawaida katika vidole vingi kwa watu wa Afro‑Caribbean.

Mkanda mpana, wenye rangi nyeusi au kahawia, mistari isiyo ya kawaida, na upanuzi wa rangi kwenye tishu za periungual ni ishara ya melanoma.

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  • Mistari mingi isiyo ya kawaida huzingatiwa. Melanonychia kwa kiasi kikubwa ni isiyo mbaya, lakini ikiwa kuna mistari mingi isiyo ya kawaida katika kiwango hiki, biopsy inaweza kuzingatiwa.
  • Muehrcke's lines
  • Brown banding
References Melanonychia: Etiology, Diagnosis, and Treatment 32055501 
NIH
Wagonjwa wengi hupata melanonychia, ambayo husababisha mabadiliko ya rangi nyeusi au kahawia ya sahani ya msumari ya kawaida. Ni hali ya kawaida inayoweza kuonekana kwenye vidole vingi vya watu wa asili ya Afro‑Caribbean. Bendi pana, yenye rangi ya kina na mistari isiyo ya kawaida, pamoja na upanuzi wa rangi kwenye tishu za periungual, ni dalili ya melanoma. Melanonychia inaweza kusababishwa na mshtuko, ugonjwa wa mfumo, dawa, au kama matokeo ya matukio ya kuvimba kama vile lichen planus au fixed drug eruption. Mistari mengi yasiyo ya kawaida yanaweza kuonekana. Ingawa melanonychia mara nyingi ni ya kimyema, ikiwa kuna mistari isiyo ya kawaida, upasuaji wa uchunguzi (biopsy) unaweza kuzingatiwa.
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.