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blackhead
(redirected from Comedone)

   Also found in: Dictionary/thesaurus, Medical, Wikipedia 0.01 sec.
blackhead, yellowish or blackish plug of material accumulated in the duct of a sebaceous gland. The material consists of keratin (horny cells of the epidermis) and modified sebum (oily secretions of the sebaceous gland). Blackheads are the primary lesions in acne acne, common inflammatory disease of the hair follicles and sebaceous glands characterized by blackheads, whiteheads, pustules, nodules and, in the more severe forms, by cysts and scarring. The lesions appear on the face, neck, back, chest, and arms.
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. Treatment is the same as for acne, with frequent cleansing of the skin followed by the application of astringent solutions. Plugs should be extracted only by a physician, since damage to the surrounding tissues occasioned by squeezing often leads to scarring.
blackhead
1. a black-tipped plug of fatty matter clogging a pore of the skin, esp the duct of a sebaceous gland
2. an infectious and often fatal disease of turkeys and some other fowl caused by the parasitic protozoa Histomonas meleagridis
3. any of various birds, esp gulls or ducks, with black plumage on the head

blackhead [′blak‚hed]
(medicine)


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Retinoids prevent comedone formation by normalizing desquamation of the follicular epithelium.
Eventually, the sebum moves outward to the skin's surface to cause a comedone or clogged pore.
Use a comedone spoon, available from chemists, to release blackheads - this works better if the skin has been warmed to open the pores.
 
 
 
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