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Irregular area of pigmentation (usually dark brown or black) found on the palms, feet, or under the nail; Longitudinal tan, black, or brown streak on a nail; Pigmentation of proximal nail fold; Other uncommon presentations can include: Amelanotic or hypomelanotic areas that may be the same color or lighter than normal skin [13]
Subungual melanomas tend to affect the big toe and thumb the most, but it can occur on any finger or toe. The melanoma appears as a brown-black discoloration of the nail bed, with Verywell Health ...
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. Dark nails are associated with B 12 deficiency. Stains of the nail plate (not the nail bed) are associated with smoking and henna use.
Beau's lines should also be distinguished from Mees' lines of the fingernails, which are areas of discoloration in the nail plate. As the nail grows out, the ridge in the nail can be seen to move upwards until it reaches the fingertip. When it reaches this point the fingertips can become sore for a few days as the nail bed is exposed by the ...
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Repeatedly thrusting the toes against a shoe's toe box can cause a subungual hematoma called jogger's toe, [8] runner's toe, or black toenail. In a marathon, several percent of runners may be affected. [4] Wearing footwear which fits helps prevent runner's toe. [4]
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.
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