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 classic literature ?
I get up in the morning, and find one asleep behind the door, and see one black head poking out from under the table, one lying on the door-mat,--and they are mopping and mowing and grinning between all the railings, and tumbling over the kitchen floor
Suddenly the manager's boy put his insolent black head in the doorway, and said in a tone of scathing contempt--
Poor devil, I could not bring myself to deal him a base blow, but I threatened him most hideously with my revolver, and left the white teeth chattering in his black head as I took the stairs three at a time.
Young Green and little Hall, commonly called Tadpole, from his great black head and thin legs, slept side by side far away by the door, and were for ever playing one another tricks, which usually ended, as on this morning, in open and violent collision; and now, unmindful of all order and authority, there they were, each hauling away at the other's bedclothes with one hand, and with the other, armed with a slipper, belabouring whatever portion of the body of his adversary came within reach.
His utter disregard of other people, as shown in his way of tossing the little womanly toys of furniture about, flinging favourite cushions under his boots for a softer rest, and crushing delicate coverings with his big body and his great black head, had the same brute selfishness at the bottom of it.
Gleams as of highly burnished silver played on the sides of his ebony black head when he inclined it slowly at the end.
The whole gang started, and looking up beheld the round black head of Sam just above them, his white eyes strained half out of their orbits, his white teeth chattering, and his whole visage shining with cold perspiration.
He saw a brown shoulder and a black head silhouetted against the churning white of the lagoon.
The dragon had probably heard the voices; for swift as lightning, his black head and forked tongue came hissing among the trees again, darting full forty feet at a stretch.
The clamor, the songs and demonstrations of all kinds increased twofold, and the whole immense ants' nest of black heads was again in motion.
Then I noticed the opening of the place was darkened by two more black heads.
On one was piled certain curiously twisted and complicated figures, called “nut-cakes,” On another were heaps of a black-looking sub stance, which, receiving its hue from molasses, was properly termed “sweet-cake ;” a wonderful favorite in the coterie of Remarkable, A third was filled, to use the language of the housekeeper, with “cards of gingerbread ;” and the last held a “ plum- cake,” so called from the number of large raisins that were showing their black heads in a substance of suspiciously similar color.