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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.
Onychorrhexis (from the Greek words ὄνυχο- ónycho-, "nail" and ῥῆξις rhexis, "bursting"), is a brittleness with breakage of finger or toenails that may result from hypothyroidism, anemia, anorexia nervosa or bulimia, or after oral retinoid therapy. [1]: 786 It can also be seen in melanoma that involves the nail and onychomycosis. [2]
Hyperpigmentation can be caused by sun damage, inflammation, or other skin injuries, including those related to acne vulgaris. [1] [2] [3]: 854 People with darker skin tones are more prone to hyperpigmentation, especially with excess sun exposure. [4] Many forms of hyperpigmentation are caused by an excess production of melanin. [4]
After healing, the nail fold skin remains low and tight at the side of the nail. The rationale is that the nail itself is usually healthy, but overgrown by skin; when walking, the bilateral nail folds are pressed upwards, which is why narrowing the nail causes excessive recurrences, contrary to narrowing the nail fold. [6]
A 1997 review (Suarez-Almazor ME, et al) [6] reports that treatment with intramuscular gold (parenteral gold) reduces disease activity and joint inflammation. Gold-containing drugs taken by mouth are less effective than by injection. Three to six months are often required before gold treatment noticeably improves symptoms.
Drug-induced pigmentation of the skin may occur as a consequence of drug administration, and the mechanism may be postinflammatory hyperpigmentation in some cases, but frequently is related to actual deposition of the offending drug in the skin. [2]: 125–6 The incidence of this change varies, and depends on the type of medication involved.
The least invasive treatment includes soaking the nail in alcohol and regularly trimming the nail back, [medical citation needed] to dry out the area and prevent bacterial colonization. [15] Some at-home treatments include soaking the nails in vinegar (diluted with water 1:1) or a chlorine bleach solution (diluted with water 1:4) at regular ...
A laceration of the nail bed causes bleeding into the constricted area underneath the hard nail plate. [1] The blood pools under the nail, giving a reddish, brownish, blueish, or grey/blackish discoloration. The blood puts pressure to the nailbed causing pain which can be throbbing in quality and disappears when the pressure on the nail bed is ...
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