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Melanonychia is a black or brown pigmentation of a nail, 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.
Tinea nigra, also known as superficial phaeohyphomycosis and Tinea nigra palmaris et plantaris, [2] is a superficial fungal infection, a type of phaeohyphomycosis rather than a tinea, that causes usually a single 1–5 cm dark brown-black, non-scaly, flat, painless patch on the palms of the hands and the soles of the feet of healthy people. [1]
Zubritsky pointed out that not all dark streaks on nails are subungual melanomas — or dangerous. A longitudinal melanonychia, for example, is a brown or black vertical nail streak that’s ...
Lindsay’s nails cause the color of the nail bed to look half white and half red or brown, whereas Terry’s nails cause the nail bed to look mostly white or washed-out, per Cleveland Clinic ...
A nail disease or onychosis is a disease or deformity of the nail. ... Melanonychia, a black, brown or grey discoloration of the nail, with numerous causes.
Other benign skin lesions that may mimic acral lentiginous melanoma include: Lentigo (sun spots), Acral Nevi (moles), or Onychomycosis (fungal infection of the nail). These skin lesions can appear as dark brown spots, like ALM, but can be distinguished on close examination or dermatoscopy . [ 7 ]