Melanonychia is a black or brown pigmentation of the normal nail plate, and may be present as a normal finding on many digits in Afro-Caribbeans, as a result of trauma, systemic disease, or medications, or as a postinflammatory event from such localized events as lichen planus or fixed drug eruption.
Iziguli eziningi zithola i‑melanonychia ephathekayo, njengoba ibangela ukuguquka okunsundu‑mnyama kwepuleti le‑nail. Kuyimbangela evamile yokushintsha umbala kwezinzipho, okunezimbangela ezisukela kokuncane kuya kokuyingozi kakhulu, njengemelanoma. I‑melanonychia ye‑longitudinal efana nebhandi ingabangelwa izici ezihlukahlukene zesikhumba noma zesistimu. 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 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.
Muehrcke's lines
Ibhande elibanzi, elinemibala ejulile, elinezigaba ezingajwayelekile kanye nesandiso esinombala ezicutsheni ze‑periungual, kuyisignali ye‑melanoma.