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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]
Blackheads (open comedones): Blackheads are small dark brown or black spots, often on the nose and chin. They happen when pores are clogged with sebum and dead skin cells, and are open at the surface.
Mongolian spot is a congenital developmental condition—that is, one existing from birth—exclusively involving the skin.The blue colour is caused by melanocytes, melanin-containing cells, that are usually located in the surface of the skin (the epidermis), but are in the deeper region (the dermis) in the location of the spot. [6]
There are a wide range of depigmenting treatments used for hyperpigmentation conditions, and responses to most are variable. [11]Most often treatment of hyperpigmentation caused by melanin overproduction (such as melasma, acne scarring, liver spots) includes the use of topical depigmenting agents, which vary in their efficacy and safety, as well as in prescription rules.
Sun spots, melasma and post-inflammatory hyperpigmentation are common types of skin discoloration that occur when excess melanin — the pigment that gives skin its color — is produced.
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)
Smoker's melanosis is seen with the naked eye as a brown to black pigmentation of the oral tissue i.e. the gums, [1] cheeks or palate [2] as well as in larynx. [3] [4] It is most often seen in the lower labial gingiva of tobacco users. Most easily it is found in Caucasians, due to their lack of a genetically caused melanin pigmentation. [5] [6]
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