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 ?
My skin felt really clean and exfoliated and I did not notice any blackheads afterwards, so I would say it worked well.
The new CLEAN & CLEAR(R) Advantage(R) Blackhead Eraser(TM) Exfoliating Cleanser is a water-resistant, battery-operated hand-held device that helps to instantly reduce blackheads and prevent new ones from forming.
Blackhead - or histomoniasis - is a disease which attacks the digestive tract of turkeys.
Treatment for Blackheads, Whiteheads, and Mild Inflammatory Acne
Countryside: Re: Blackhead in turkeys 81/5:83: Controlling blackhead disease will be very difficult in a free range system.
If you are battling with blackheads then Clearasil claim to have the answer with their new range of blackhead busting products.
The brand has been relaunched with sleeker, more sophisticated packaging and the introduction of two new ranges (above), Clearasil Blackhead Control with natural sea salt and Clearasil Oil Control with green tea and peppermint.
Contemporaneous inoculation with cecal coccidia (Eimeria adenoeides) as a predisposing factor in blackhead infections was studied using the model.
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.
The liver disease blackhead has hit flocks in Germany, France and the Netherlands, and it has been detected in small flocks in the UK.
Fortunately, blackheads can be safely and successfully treated with salicylic acid-based products, such as Oxy Blackhead Clearing Pads.
If the cells reach the skin surface, they mix with melanin (skin pigment) and turn dark--presto, blackhead.