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  2. Acanthosis nigricans - Wikipedia

    en.wikipedia.org/wiki/Acanthosis_nigricans

    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]

  3. Argyria - Wikipedia

    en.wikipedia.org/wiki/Argyria

    The most dramatic symptom of argyria is that the skin turns blue or blue-gray. It may take the form of generalized argyria or local argyria. Generalized argyria affects large areas over much of the visible surface of the body. Local argyria shows in limited regions of the body, such as patches of skin, parts of the mucous membrane or the ...

  4. Iron poisoning - Wikipedia

    en.wikipedia.org/wiki/Iron_poisoning

    Iron poisoning typically occurs from ingestion of excess iron that results in acute toxicity. Mild symptoms which occur within hours include vomiting, diarrhea, abdominal pain, and drowsiness. [1] In more severe cases, symptoms can include tachypnea, low blood pressure, seizures, or coma. [2]

  5. These Pictures Will Help You Identify the Most Common Skin Rashes

    www.aol.com/pictures-help-identify-most-common...

    Other symptoms to note: The legions are usually itchy and may cause skin discoloration as they heal. Lichen planus does not have one single cause—illnesses, allergies, and stress can all trigger ...

  6. This Chronic Skin Condition Is A Common Cause Of Dark ... - AOL

    www.aol.com/chronic-skin-condition-common-cause...

    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 ...

  7. Postinflammatory hyperpigmentation - Wikipedia

    en.wikipedia.org/wiki/Postinflammatory_hyper...

    Postinflammatory hyperpigmentation (PIH) is a skin condition characterized by the darkening of the skin (hyperpigmentation) following an inflammatory injury, such as acne, dermatitis, infectious disease, or trauma. Less frequently, it may occur as a complication of a medical procedure performed on the skin. It is a common cause of skin ...

  8. Hyperpigmentation - Wikipedia

    en.wikipedia.org/wiki/Hyperpigmentation

    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 .

  9. Drug-induced pigmentation - Wikipedia

    en.wikipedia.org/wiki/Drug-induced_pigmentation

    Drug-induced pigmentation of the skin may occur as a consequence of drug administration, and the mechanism may be postinflammatory hyperpigmentation in some cases, but frequently is related to actual deposition of the offending drug in the skin. [2]: 125–6 The incidence of this change varies, and depends on the type of medication involved.