blackhead


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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 acneacne,
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

[′blak‚hed]
(medicine)

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
References in periodicals archive ?
Dermatologists use chemical peels with great caution to treat two types of acne - blackheads and papules.
Historically, blackhead disease could be readily treated or prevented by the use of nitroimidazole drugs (Lucas, 1962; van der Heijden and Landman, 2007; Reynolds et al.
Most turkey feeds will contain medication which will fight blackhead and also coccidiosis - a more common poultry problem, again affecting the digestive system.
Another common myth is that dirty skin causes acne; however, blackheads and other acne lesions are not caused by dirt.
Also, regular worming can help control the cecal worm whose eggs are host to the blackhead parasite.
Noncomedogenic means that using the cosmetic should not result in the formation of whiteheads and blackheads.
In addition, treatment should be aimed at the plugged, inflamed hair follicles and blackheads on his chin.
My skin felt really clean and exfoliated and I did not notice any blackheads afterwards, so I would say it worked well.
These Visibly Clear Blackhead Eliminating Daily Cleansing Cushions by Neutrogena are dual sided.
Therefore, ducks do not seem to be a susceptible host for blackhead but may act as carrier animals for H meleagridis.
TWO anglers have been plucked to safety from rocks off Blackhead in County Antrim.
The warning from Liberal Democrat food and rural affairs spokesman, Andrew George, follows confirmation from Defra that the disease blackhead, which kills infected turkeys within a week, has hit some UK flocks.