Melanonychiahttps://en.wikipedia.org/wiki/Melanonychia
Melanonychia ni rangi nyeusi au kahawia ya bati la kawaida la kucha, na inaweza kutokea kama mabadiliko ya kawaida katika watu wengi wa Afro‑Caribbean.

Banda pana, rangi nyingi, mistari isiyo ya kawaida, na upanuzi wa rangi kwenye tishu za periungual ni ishara ya melanoma.

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  • Mistari mengi isiyo ya kawaida huzingatiwa. Melanonychia kwa kiasi kikubwa si hatari, lakini ikiwa kuna mistari mengi isiyo ya kawaida katika kiwango hiki, biopsy inaweza kuzingatiwa.
  • Muehrcke's lines
  • Ubandi wa kahawia
References Melanonychia: Etiology, Diagnosis, and Treatment 32055501 
NIH
Wagonjwa wengi hupata melanonychia, ambayo husababisha kubadilika kwa rangi ya hudhurungi hadi nyeusi ya sahani ya msumari. Ni sababu ya mara kwa mara ya kubadilika kwa rangi ya kucha, ikijumuisha sababu zisizo na madhara hadi hatari kama vile melanoma. Melanonychia ya bendi ya longitudinal inaweza kusababishwa na mambo mbalimbali ya ndani au ya kimfumo.
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.