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.
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Ezohiko lerro anitz ikusten dira. Melanonikia (Melanonychia) normalean ona da gehienetan, baina maila honetan lerro irregular asko agertzen direnean, biopsi bat egitea gomendatzen da.
Gaixo askok melanonychia kezkagarria ikusten dute, iltze-plakaren marroi-beltza dekolorazioa eragiten baitu. Azazkalen kolorea uzteak arrazoi maiz izaten du, kausak onberon eta potentzialki larriak dituztenak, hala nola melanomak. Luzera-banda-itxurako melanonikia hainbat faktore lokal edo sistemikoetatik etor daiteke. 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.
Lerro irregularak eta ehun periungualetan luzapena, pigmentatutako banda zabal eta sakon bat, melanomaren seinale izan daitezke.