Melanonychiahttps://en.wikipedia.org/wiki/Melanonychia
Melanonychia bụ ụcha ojii ma ọ bụ aja aja nke efere ntu nkịtị; ọ nwekwara ike ịdị ka nchọpụta nkịtị n’ọtụtụ ndị Afro‑Caribbean.

Eriri obosara nwere pigmenti, nke nwere ahịrị na-adịghị mma yana ndọtị pigmenti n’akụkụ anụ ahụ, bụ ihe ịrịba ama maka melanoma.

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  • A na-ahụ ọtụtụ ahịrị na-adịghị ahụkebe. Melanonychia na-adịkarị mma, mana ọ bụrụ na ọtụtụ ahịrị apụta n’oge a ma ọ bụ na ọkwa a, enwere ike ịtụle biopsy.
  • Muehrcke's lines
  • Ụdị agba aja
References Melanonychia: Etiology, Diagnosis, and Treatment 32055501 
NIH
Ọtụtụ ndị ọrịa na-ahụ melanonychia, n'ihi na ọ na-ebute mwepụ agba aja nke efere ntu. Ọ bụ ihe na-emekarị maka ntu, na-akpata site na benign ruo nwere ike ịdị njọ, dịka melanomas. Ogologo oge melanonychia nwere ike ịpụta site n’ihe dị iche iche, mpaghara ma ọ bụ usoro.
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.