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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.
Some of the characteristic features of Noonan syndrome include a large head with excess skin on the back of the neck, low hairline at the nape of the neck, high hairline at the front of the head, triangular face shape, broad forehead, and a short, webbed neck.
Because of the differences between mucous membranes and the skin (e.g., keratinizing mucosa does not have a stratum lucidum and non keratinizing mucosa does not have this layer or normally a stratum corneum or a stratum granulosum), sometimes specialized texts give slightly different definitions of hyperkeratosis in the context of mucosae.
This causes an excess in skin cells that cause patches and scabs. ... If your itching and rash extend past the scalp behind the ears and onto the neck, you are most likely allergic to your shampoo ...
If you do experience prediabetes symptoms, you may notice: Small skin growths. Darkened skin in your armpits or around your neck. ... Having excess weight or obesity.
These are characterized by dark patches within skin folds in locations like the neck, armpits, or groin. Skin tags. These small and soft growths often develop on the neck or underarms.
A webbed neck, or pterygium colli, is a congenital skin fold that runs along the sides of the neck down to the shoulders. There are many variants. There are many variants. Signs and symptoms
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.