comedo

(redirected from comedos)
Also found in: Dictionary, Thesaurus, Encyclopedia.

comedo

 [kom´ĕ-do] (pl. comedo´nes) (L.)
a plug of keratin and sebum within the dilated orifice of a hair follicle frequently containing the bacteria Corynebacterium acnes, Staphylococcus albus, and Pityrosporum ovale; see also acne vulgaris.
closed comedo whitehead (def. 1).
open comedo blackhead.

com·e·do

, pl.

com·e·dos

,

com·e·do·nes

(kom'ē-dō, kō-mē'dō; kom'ē-dōz; kom-ē-dō'nēz), The correct singular form is comedo, not comedone.
A dilated hair follicle infundibulum filled with keratin squamae, bacteria, particularly Propionibacterium acnes, and sebum; the primary lesion of acne vulgaris.
[L. a glutton, fr. com-edo, to eat up]

comedo

/com·e·do/ (kom´ĕ-do) pl. comedo´nes   a plug of keratin and sebum within the dilated orifice of a hair follicle, frequently containing the bacteria Propionobacterium acnes, Staphylococcus albus, and Pityrosporon ovale.
closed comedo  whitehead; a comedo whose opening is not widely dilated, appearing as a small, flesh-colored papule; it may rupture and cause an inflammatory lesion in the dermis.
open comedo  blackhead; a comedo with a widely dilated orifice in which the pigmented impaction is visible at the skin surface.

comedo

(kŏm′ĭ-dō′)
n. pl. come·dos or come·dones (-dō′nēz)
The primary lesion of acne vulgaris, consisting of a hair follicle that is occluded with sebum and keratin; a blackhead or whitehead.

comedo

[kom′idō] pl. comedones
Etymology: L, comedere, to consume
blackhead (open comedo) or whitehead (closed comedo), the basic lesion of acne vulgaris, caused by an accumulation of keratin and sebum within the opening of a hair follicle. Compare milium.
enlarge picture
Comedo

comedo

Blackhead, plural comedones Dermatology A plug of keratin and sebum within the dilated orifice of a hair follicle, which may contain bacteria–eg, Propionibacterium acnes, P granulosum, Staphylococcus albus, or yeast, Pityrosporon ovale. See Acne. Cf Comedocarcinoma.

com·e·do

, pl. comedones (kom'ĕ-dō, dō'nēz)
A dilated hair follicle infundibulum filled with keratin squamae, bacteria, particularly Propionibacterium acnes, and sebum; the primary lesion of acne vulgaris.
[L. a glutton, fr. com-edo, to eat up]
Enlarge picture
COMEDONES
Enlarge picture
COMEDONES

comedo

(kŏm′ă-dō) plural.comedonesplural.comedos [L. comedere, to eat up]
The typical small skin lesion of acne vulgaris and seborrheic dermatitis. The closed form is called a whitehead. It consists of a papule from which the contents are not easily expressed. When inflamed these lesions form pustules and nodules. The open form of comedo, called a blackhead, is rarely inflamed. It has a dilated opening from which the oily debris is easily expressed. Both forms are usually located on the face, but the chest and back may be involved.
See: illustrationillustration

Comedo

A hard plug composed of sebum and dead skin cells. The mildest type of acne.
Mentioned in: Acne

comedo

pl. comedones; a blackhead; a plug of keratin and sebum within the dilated orifice of a hair follicle frequently containing bacteria. Found in feline and canine acne, hyperadrenocorticism, Schnauzer comedo syndrome (see below).

Schnauzer comedo syndrome
a condition in which numerous comedones form in the skin over the back of certain predisposed Schnauzer dogs, usually of the miniature variety. The cause is unknown but believed to be an inherited disorder of keratinization.