Blackhead: Difference between revisions
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==References== |
==References== |
Revision as of 11:40, 20 August 2009
It has been suggested that this article be merged into Comedo and Talk:Comedo. (Discuss) Proposed since November 2008. |
Blackhead |
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A blackhead (medically known as an open comedo[1] , plural comedones[2]) is a yellowish or blackish bump or plug on the skin. A blackhead is a type of acne vulgaris. It is caused by excess oils that have accumulated in the sebaceous gland's duct. The substance found in these bumps mostly consists of keratin and modified sebum (an oily secretion of the sebaceous gland), which darkens as it oxidizes.[3] Clogged hair follicles, where blackheads often occur, reflect light irregularly to produce a blackhead's "black" hue.[4] For this reason, the blockage might not necessarily look black when extracted from the pore, but may have a more yellow-brown colour as a result of its melanin content.
In contrast, a "whitehead" (more commonly known as a pimple or a closed comedo)[5] is a follicle that is filled with the same material, sebum, but has a microscopic opening to the skin surface. Since the air cannot reach the follicle, the material is not oxidized, and remains white.
Removal
Blackheads do not necessarily need to be removed (the body often does this itself, without any complications), but they may be treated with acne medication, such as salicylic acid, exfoliants, topical retinoids, or they may be extracted using a comedone extractor[6] or blackhead strip - an adhesive, tape-like strip which is adhered to the nose and removed about ten minutes later, taking the blackheads underneath with it. [7]
Severe cases may require oral medication.[8]
See also
References
- ^ Medicine.net - Medical dictionary - definition of blackhead/open comedo
- ^ Merriam–Webster Online
- ^ Blackhead definition at encyclopedia.com
- ^ Blackhead information at About.com
- ^ Comedone information at About.com
- ^ Using blackheads extractor - Nosecosmetic.com
- ^ Acnetalks.com
- ^ Skincarephysicians.com