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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.
In short, melasma is a chronic skin condition that appears as darkened areas on the face due to an overproduction of melanin, says Gina Charles, MO, a family physician specializing in skincare. It ...
It causes itching, inflammation, a rash, cracked skin, blisters, and scabs. ... hair, as their scalp is exposed to more sunlight. “It is more rare to get skin cancer on a scalp full of hair ...
Skin Swab: A swab of the affected area may be taken to be looked at more closely under a microscope. This helps to identify the specific bacteria, yeast, or fungi causing the infection.
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]
The exact mechanism of the condition is unknown. Some studies have suggested the itching occurs in response to increased fibrinolytic activity in the skin, [5] [6] inappropriate activation of the sympathetic nervous system, [7] increased activity of acetylcholinesterase, [8] [9] or an increase in mast cell degranulation that releases histamine and other chemicals into the body.
The most common type, atopic dermatitis, causes chronic itchy and dry and cracked skin, and it is strongly associated with allergies such as asthma or hay fever.
The symptoms of seborrhoeic dermatitis, on the other hand, tend to appear gradually, from dry or greasy scaling of the scalp to scaling of facial areas, sometimes with itching, but without hair loss. [22] In newborns, the condition causes a thick and yellowish scalp rash, often accompanied by a diaper rash.
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