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 ?
meleagridis was obtained from blackhead outbreaks in turkey showing no response to medication from Faisalabad, Pakistan in 2013.
Resorcinol, salicylic acid, and sulfur help break down blackheads and whiteheads.
Q: Whiteheads, blackheads, pimples--what's the difference?
Designed for everyday use, Clearasil Daily Blackhead Control products with Natural Sea Salt have exfoliating properties to help clear blackheads, and a purifying action to help prevent them from forming.
The anglers called the emergency services after one of the men suffered an asthma attack while fishing near Blackhead.
The disease, known as blackhead, kills infected turkeys within a week and is currently untreatable.
Ten million turkeys now being reared for the festive period in the UK are at risk from blackhead, which spreads through earthworms and causes the birds to waste away slowly.
Ten million turkeys being reared for the festive period are at risk from blackhead, which spreads through earthworms and causes the birds to waste away slowly.
Those 107 points they gave up stuck out like a bulbous blackhead.
The alarm was raised at around 9am when the Irish Coast Guard received a report of a person in the water at Blackhead in Co Clare.
A blackhead forms when excess keratin--an insoluble protein that is the chief constituent of hair--collects in a follicle, the slender, tubular shaft that contains the root of a hair.
To help, Clearasil has launched two new products, Clearasil Daily Blackhead Control and Clearasil Daily Oil Control.