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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]
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.
Any condition that causes the eyes to itch can contribute to darker circles due to rubbing or scratching the skin around them. Hay fever sufferers in particular will notice under-eye "smudges" during the height of the allergy season. Atopy can lead to frequent rubbing of the eyes, leading to local inflammation and increased pigmentation. [4]
Conditions of the mucous membranes involve the moist linings of the eyes, nose, mouth, genitals, and anus. [34] Acatalasia (acatalasemia, Takahara's disease) Acquired dyskeratotic leukoplakia; Actinic cheilitis (actinic cheilosis)
A rash is a change of the skin that affects its color, appearance, or texture.. A rash may be localized in one part of the body, or affect all the skin. Rashes may cause the skin to change color, itch, become warm, bumpy, chapped, dry, cracked or blistered, swell, and may be painful.
The Bottom Line on the Side Effects of Minoxidil Minoxidil is generally a safe and effective medication — one of many reasons it’s available over the counter, without any need for a prescription.
Myasthenia gravis, or MG, is a chronic autoimmune neuromuscular disorder that causes muscle weakness and fatigue. Myasthenia gravis is one of the rarest and most concerning muscular disorders ...
Fibrous papule of the nose is a harmless small bump on or near the nose. It is typically dome-shaped, skin-colored, white or reddish, smooth and firm. [1] [2] Less frequently it can occur elsewhere on the face. [3] Sometimes there are a few. [1] It may be shiny and remains unchanged for life. There may be a central hair. [3] The precise cause ...