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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.
The Casal collar or Casal necklace is a medical sign in which there is a redness and darkening of the skin around the neck, seen in people with pellagra. [2] It becomes prominent following exposure to sun, and can be itchy with a burning feeling and pain. [1] It can blister and weep, and turn into thick dark skin, with a coppery hue. [1]
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]
What are the symptoms of skin cancer? Woman diagnosed with melanoma at 21 after mole on neck suddenly began growing, getting darker. Her mother saw the changes.
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 ...
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]
Poikiloderma is a skin condition that consists of areas of hypopigmentation, hyperpigmentation, telangiectasias and atrophy. Poikiloderma of Civatte is most frequently seen on the chest or the neck, characterized by red colored pigment on the skin that is commonly associated with sun damage.
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