blackhead

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blackhead

 [blak´hed″]
a plug of keratin and sebum within the dilated orifice of a hair follicle. The dark color is caused not by dirt but by the discoloring effect of air on the sebum in the clogged pore. Infection may cause it to develop into a pustule or boil. See also acne vulgaris. Called also open comedo.

blackhead

/black·head/ (blak´hed) open comedo.

blackhead

(blăk′hĕd′)
n.
1. A skin lesion consisting of a hair follicle that is occluded with sebum and keratin, appearing black at the surface.
2. An infectious disease of turkeys and some wildfowl that is caused by a protozoan (Histomonas meleagridis) and results in lesions of the intestine and liver. Also called enterohepatitis, histomoniasis, infectious enterohepatitis.

blackhead

See comedo.

blackhead

A blocked sebaceous gland which is open to air, where the secretions oxidise, turning black.

blackhead

Open comedo A blocked sebaceous gland which is open to air, where the secretions oxidize, turning black. Cf Whitehead.

his·to·mo·ni·a·sis

(his'tō-mŏ-nī'ă-sis)
A disease chiefly affecting turkeys, caused by Histomonas meleagridis and characterized by ulcerative and necrotic lesions of the liver and cecum, acute onset, and a high mortality rate. It is transmitted inside the eggs of the nematode Heterakis gallinae, which is primarily responsible for maintaining and spreading the infection.
Synonym(s): blackhead (2) .

o·pen com·e·do

(ō'pĕn kom'ĕ-dō)
A comedo with a wide opening on the skin surface capped with a melanin-containing blackened mass of epithelial debris.
Synonym(s): blackhead (1) .

blackhead

An accumulation of fatty sebaceous material in a sebaceous gland or hair follicle, with oxidation of the outer layer, causing a colour change from white to dark brown or black. Blackheads, or comedones, occur in the skin disorder ACNE.

Blackhead

A plug of fatty cells capped with a blackened mass.
Mentioned in: Rosacea

Patient discussion about blackhead

Q. I have this blackhead on my cheek area for about a year..,How do I remove it?

A. This type of blackhead you are describing sounds like comedonal (non-inflammatory) acne, as opposed to acne that is inflammatory or severe inflammatory (which usually will not remain for a year on the skin). There are many basic local treatments which can be found at pharmacies over-the-counter. Whether it is gel or cream (which are rubbed into the pores over the affected region), bar soaps or washes - it is important to keep the skin clean of bacteria, that may worsen blackheads.

More discussions about blackhead
References in periodicals archive ?
He was hired to coach the University of Washington's football team, making Washington the only I-A school with black head coaches in two major sports; Lorenzo Romar leads the Huskies men's basketball team.
The sledgehammer he used had a black head with a brown handle.
Both wore black head scarves covering their hair and black waterproof type jackets with hoods.
SOUTH AFRICA last night appointed their first black head coach when Peter de Villiers was named as successor to World Cup-winning Jake White.
Shaukat Hussain is proud to be the city's only black head teacher.
Coastguards' calculations showed it was 'not feasible' his body could have floated from Mylor to where it was found off Black Head.
Grey herons are noisy but make loving pairs and often perform pair-bonding routines such as "billing" - gently tapping bills together - and raising up their black head plumes to each other.
As it was, he was knocked sideways, and although he still entered the back-straight at the head of affairs, defending champ Black Head was far too close for comfort and duly powered past on the run-in.
Peregrine falcons, which have blue-grey plumage and a black head, are protected under the Wildlife and Countryside Act 1981.
We need to change the mindset about what black people represent"I am Liverpool's first black head teacher but I'm not special - we are talented and we are capable
His body was found off Black Head, near the Lizard.
Today the NBA boasts 13 black head coaches, including Lenny Wilkens, coach for the Toronto Raptors (who holds the record for the most wins among all NBA coaches, past and present).