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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. [1]
Dermatosis papulosa nigra (DPN) is a condition of many small, benign skin lesions on the face, a condition generally presenting on dark-skinned individuals. [1]: 638–9 DPN is extremely common, affecting up to 30% of Black people in the US. [2] From a histological perspective, DPN resembles seborrheic keratoses. [3]
The distinctive solid black colour of the Ayam Cemani (rooster shown) chicken breed is due to hyperpigmentation, with the bird's feathers, skin, beak and internal organs all being affected. Hyperpigmentation can be caused by sun damage, inflammation, or other skin injuries, including those related to acne vulgaris.
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The primary causes of fiddler's neck are constant friction and local pressure. [2] It is well known among professional orchestra musicians but is "not well recognized by dermatologists", [2] and a red mark on the left side of the neck under the jaw "functions as an identifying sign" of a violinist or violist "in public without seeing the ...
Pseudofolliculitis nuchae, a related condition, occurs on the back of the neck, often along the posterior hairline, when curved hairs are cut short and allowed to grow back into the skin. Left untreated, this can develop into acne keloidalis nuchae , a condition in which hard, dark keloid -like bumps form on the neck.
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