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Acanthosis nigricans is a medical sign characterised by brown-to-black, poorly defined, velvety hyperpigmentation of the skin. [1] It is usually found in body folds, [2] such as the posterior and lateral folds of the neck, the armpits, groin, navel, forehead and other areas.
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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]
Fiddler's neck usually involves highly localized lichenification, mild hyperpigmentation, and erythema where the chin rest or instrument body presses against the skin of the neck. [2] Other signs and symptoms include scale buildup, cyst and scar formation, papules and pustules related to local infection, and focal edema. [1]
Problem addressed: When considering the problem a skincare product addresses, focus on your specific skin concerns such as acne, dryness, or hyperpigmentation. Look for products that have targeted ...
The most usual signs and symptoms are the appearance of a chronic, painless mass in the neck, which is persistent and usually grows with time.The mass is referred to as a "cold abscess", because there is no accompanying local color or warmth and the overlying skin acquires a violaceous (bluish-purple) color.
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This child has the casal collar skin rash around the neck associated with pellagra. Man with pellagra with typical skin lesions. The classic symptoms of pellagra are diarrhea, dermatitis, dementia, and death ("the four Ds"). [4] A more comprehensive list of symptoms includes: Dermatitis (characteristic "broad collar" rash known as casal collar ...