The plural of comedo, the primary sign of acne, consisting of a dilated (widened) hair follicle filled with keratin squamae (skin debris), bacteria, and sebum (oil). Comedones may be closed or open. A closed comedo has an obstructed opening to the skin and may rupture to cause a low-grade skin inflammatory reaction in the area. The common name for a closed comedo is a whitehead. An open comedo has a wide opening to the skin and is capped with a blackened mass of skin debris. It is commonly known as a blackhead. Acne occurs when sebaceous glands of the skin begin to secrete oil during puberty. These glands are stimulated by male hormones that are produced in the adrenal glands of both boys and girls. The oil lubricates and protects the skin. Under certain circumstances, cells that are close to the openings of the sebaceous glands block the openings. This causes a buildup of oil underneath the skin. Bacteria, which live in everyone's skin but generally mind their own business, feast on this oil, multiply, and cause the surrounding tissues to become inflamed. If the inflammation is right near the surface, a pustule is formed; if it is deeper, a papule (pimple); deeper still and it becomes a cyst. If the oil breaks though to the surface, the result is a whitehead. If the oil becomes oxidized (that is, acted on by oxygen in the air), the oil changes from white to black, and the result is a blackhead. This is how the two types of comedones develop. Comedo is the Latin word for glutton. The ancients believed that the contents of a comedo were the remains of a gluttonous worm. Note that the preferred plural form of comedo is comedones.

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co·me·do·nes (koґmə-doґnēz) plural of comedo.

Medical dictionary. 2011.

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  • Comedones — Comedo Com e*do, n.; pl. {Comedones}. [L., a glutton. See {Comestible}.] (Med.) A small nodule or cystic tumor, common on the nose, etc., which on pressure allows the escape of a yellow wormlike mass of retained oily secretion, with a black head… …   The Collaborative International Dictionary of English

  • comedones — com·e·do || kÉ’mÉ™dəʊ n. blackhead, black topped pimple (on the surface of the skin) …   English contemporary dictionary

  • Комедон (Comedo, Множ. Comedones) — см. Угорь черный. Источник: Медицинский словарь …   Медицинские термины

  • elastosis nodular con quistes y comedones — Ver enfermedad de Favre Racouchot …   Diccionario de oftalmología

  • comedone — {{hw}}{{comedone}}{{/hw}}s. m. Rilievo puntiforme nerastro che si forma sulla cute spec. del viso per l ostruzione dell orifizio di una ghiandola sebacea …   Enciclopedia di italiano

  • Acné — Clasificación y recursos externos CIE 10 L70.0 CIE 9 706.1 MedlinePlus …   Wikipedia Español

  • Acne vulgaris — This article is about a skin disease commonly found during adolescence. For other acneform skin diseases, see Acne (disambiguation). Acne vulgaris Classification and external resources …   Wikipedia

  • acne — acned, adj. /ak nee/, n. Pathol. an inflammatory disease of the sebaceous glands, characterized by comedones and pimples, esp. on the face, back, and chest, and, in severe cases, by cysts and nodules resulting in scarring. Also called acne… …   Universalium

  • Blackhead — This article is about the skin condition. For other uses, see Blackhead (disambiguation). Blackhead Classification and external resources Blackheads on a nose. ICD 9 …   Wikipedia

  • Comedo extraction — is a widely used method of treatment for acne vulgaris.[1] A dermatologist or cosmetologist may extract blackheads (open comedones) using gentle pressure around the pore opening, and whiteheads (closed comedones) by incision with a large needle… …   Wikipedia

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