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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.
The melanoma appears as a brown-black discoloration of the nail bed, ... A longitudinal melanonychia, for example, is a brown or black vertical nail streak that’s typically benign.
Melanonychia (longitudinal streaking that darkens or does not grow out), especially on the thumb or big toe, may indicate subungual melanoma. White lines across the nail (leukonychia striata, or transverse leukonychia) may be Mees' lines or Muehrcke's lines. Small white patches are known as leukonychia punctata.
However, these lines could also result from nail psoriasis or longitudinal melanonychia (effectively a mole of the nail), Stringer says. In extreme cases, these lines may turn out to be a squamous ...
Melanonychia with pigmentation of the proximal nail fold. [3]: 671 This is an important sign of subungual melanoma although is not an infallible predictor. Periungual hyperpigmentation occurs in at least one nonmelanoma skin cancer, Bowen's disease of the nail unit.
Mom's Stage 4 Melanoma Spread from Fingernail to Brain, Says She 'Begged for' Scans That Could Have Caught It Sooner. Cara Lynn Shultz. January 24, 2025 at 6:51 PM. Kelly Heather / SWNS (2)
Acral lentiginous melanoma (ALM) is a type of skin cancer. [6] It typically begins as a uniform brownish mark before becoming darker and wider with a blurred, irregular border. ALM is most frequently seen on the foot of a person with darker skin but can also be found in non-sun exposed areas such as the palms , soles , and under finger and ...
Longitudinal melanonychia; Loose anagen syndrome (loose anagen hair syndrome) ... Spitz nevus (benign juvenile melanoma, epithelioid and spindle cell nevus, ...