Melanoniha (Melanonychia) je crna ili smeđa pigmentacija normalne ploče nokta i može biti prisutna kao normalan nalaz na mnogim prstima kod Afro‑Karibaca.
Široka, duboko pigmentirana traka s nepravilnim linijama i pigmentiranim proširenjem na periungualna tkiva znak je melanoma.
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.
Uočeno je neuobičajeno više linija. Melanonihija (Melanonychia) je uglavnom dobroćudan, ali ako na ovom nivou ima mnogo nepravilnih linija, može se razmotriti biopsija.
Mnogi pacijenti zabrinjava melanoničija (melanonychia), jer uzrokuje smeđe‑crnu promjenu boje nokatne ploče. To je čest razlog za promjenu boje noktiju, a uzroci variraju od benignih do potencijalno ozbiljnih, poput melanoma. Uzdužna trakasta melanoničija (melanonychia) može proizaći iz različitih lokalnih ili sistemskih faktora. 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.
Muehrckeove linije (Muehrcke's lines)
Široka, duboko pigmentirana traka s nepravilnim linijama i pigmentiranim proširenjem na periungualna tkiva znak je melanoma.