Melanonychiahttps://en.wikipedia.org/wiki/Melanonychia
Melanonychia ni rangi nyeusi au kahawia ya bati la kawaida la kucha, na inaweza kuwa kama matokeo ya kawaida katika tarakimu nyingi katika watu wa Afro-Caribbean.

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

☆ Katika matokeo ya 2022 ya Stiftung Warentest kutoka Ujerumani, kuridhika kwa watumiaji na ModelDerm kulikuwa chini kidogo kuliko na mashauriano ya matibabu ya simu yanayolipishwa.
  • Mistari mingi isiyo ya kawaida huzingatiwa. Melanonychia kwa kiasi kikubwa ni 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 inawahusu, kwani husababisha kubadilika kwa rangi ya hudhurungi-nyeusi ya sahani ya msumari. Ni sababu ya mara kwa mara ya kubadilika rangi ya kucha, ikiwa na sababu kuanzia zisizo na madhara hadi hatari, kama vile melanoma. Melanonychia kama bendi ya longitudinal inaweza kutokana 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.