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 ?
There are 12 Black head coaches in Division 1 FBS major-college football, including seven at the aforementioned Power 5 conferences.
But the father of one believes there is still "unconscious cultural bias" in favour of white people four decades afterBetty Campbellbecame Wales' first black head teacher.
Cardiff South MP Stephen Doughty said he had first met Mrs Campbell when he was "nine or 10" and said it was a "huge achievement" for her to become the country's first black head teacher.
HB 3118 backers have expressed hope that Oregon's action could help prompt the National Collegiate Athletic Association to adopt a similar minority-interview requirement for football, since the NCAA's 120 largest football programs have six black head coaches.
In 1979, Wichita State hired Willie Jeffries to become the first black head football coach at a Division I program.
Dungy, the highest-paid of just two black head coaches that year, was ranked 14th overall at $2.
There are only two other black head coaches out of the 117 NCAA Division I-A football programs.
Beyond their competive drive, the three Black head coaches know there's a lot more riding on their success than won/loss stats, and division titles and trophies.
Pc Jones said: ``We ran out to the garden and saw the black head of a feline animal.
But the bird I was watching had a brownish head, not the requisite black head of a male oriole.
There is an arb between Sporting and Spreadex when it comes to Black Head and Vintage Cleaner in the 8pm, but that is the only reason for attempting to play on an otherwise unfathomable clash.
The black head changes to smudgy white just before they leave the area for the winter.