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A comedo is a clogged hair follicle (pore) in the skin. [2] Keratin (skin debris) combines with oil to block the follicle. [3] A comedo can be open (blackhead) or closed by skin (whitehead) and occur with or without acne. [3]
Part of the structural formula of eumelanin. "(COOH)" can be COOH or H, or (more rarely) other substituents.The arrow denotes where the polymer continues. Eumelanin has two forms linked to 5,6-dihydroxyindole (DHI) and 5,6-dihydroxyindole-2-carboxylic acid (DHICA).
One of the common concerns regarding the use of mineral oil is its presence on several lists of comedogenic substances. [ citation needed ] These lists of comedogenic substances were developed many years ago and are frequently quoted in the dermatological literature.
Castor oil and its derivatives are found in many cosmetics as it is "non-comedogenic" (does not exacerbate or contribute to acne). [3]Cerebrosides (cells from the nervous systems of cattle or swine) were once used in some high-end skin-care products to increase moisture retention and to create a smooth skin surface, [4] however the BSE controversy has put an end to this practice.
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Acne cosmetica is a type of contact acneiform eruption caused by or aggravated by cosmetics. [1] Signs and symptoms include a dense group of similar sized closed comedones and scattered small bumps, typically over the skin where the cosmetic has been applied. [1]
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