Melanonychiahttps://en.wikipedia.org/wiki/Melanonychia
Melanonychia baƙar fata ne ko launin ruwan kasa na farantin ƙusa na yau da kullun, kuma yana iya kasancewa a matsayin bincike na yau da kullun akan lambobi da yawa a cikin mutanen Afro‑Caribbeans.

Band mai fadi, mai launi mai zurfi tare da layuka marasa tsari da tsawaitar launi zuwa ga ƙwayoyin periungual alama ce ta melanoma.

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  • Ana lura da layukan da ba a saba gani ba. Melanonychia galibi ba shi da cuta, amma idan akwai layukan da ba su dace ba a wannan matakin, ana iya yin la'akari da biopsy.
  • Muehrcke's lines
  • Brown banding
References Melanonychia: Etiology, Diagnosis, and Treatment 32055501 
NIH
Melanonychia (melanonychia) shine launi baƙa ko ruwan ƙasa na farantin ƙusa na al'ada, kuma na iya kasancewa abin da aka saba gani a yatsu da yawa a mutanen Afro‑Caribbean. Band ɗin faɗi, mai launi mai zurfi tare da layuka marasa tsari da faɗaɗa zuwa ƙwayoyin periungual alama ce ta melanoma (melanoma). Melanonychia mai tsawon banda na iya tasowa daga yanayi daban-daban na gida ko na tsarin jiki.
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.