Definition of comedo in English:


nounplural noun comedones/ˌkäməˈdōnēz/

technical term for blackhead (sense 1)
‘This is a chronic inflammation of the hair follicle and sebaceous gland (pilosebaceous unit) characterized by pustules, comedones, cysts, and scars, and it affects most adolescents.’
  • ‘The first technique works wonders in treating large boils, abscesses (whether hot or cold), and evidently, also big or tight clusters of acne pustules and comedones.’
  • ‘This results in enlargement of the sebaceous glands, which can eventually lead to the development of comedones (black-heads).’
  • ‘Certain occupations and activities seem to favour the formation of comedones or acne.’
  • ‘If the plugged follicle, or comedo, stays beneath the skin, it is called a closed comedo or whitehead.’
  • ‘If the lipid material accumulates in the hair follicle, we have the formation of comedones, or blackheads.’
  • ‘A closed comedo, or white head, occurs when the blockage is complete.’
  • ‘If the plug enlarges and is on the surface of the skin, exposed to the air, it is called an open comedo, or blackhead.’
  • ‘This subtype resembles acne vulgaris, but with the absence of comedones.’
  • ‘The basic acne lesion, called the comedo (KOM-e-do), is simply an enlarged and plugged hair follicle.’
  • ‘Steroid-induced acne often is of a distinctive variety, being predominantly formed of inflammatory papules and pustules, which are often small and uniformly sized, with few comedones.’
  • ‘In the patient with comedones and inflammatory lesions, a comedolytic agent such as tretinoin, adapalene or azelaic acid may be combined with benzoyl peroxide or a topical antibiotic.’
  • ‘Retinoids, which are derivatives of vitamin A, function by slowing the desquamation process, thereby decreasing the number of comedones and microcomedones.’
  • ‘This obstruction leads to the formation of comedones, which can become inflamed because of overgrowth of Propionibacterium acnes.’
  • ‘It most often manifests in adolescents as comedones, papulopustules, and nodulocysts.’



/ˈkäməˌdō/ /ˈkɑməˌdoʊ/


Late 18th century from Latin, literally ‘glutton’, from comedere ‘eat up’, from com- ‘altogether’ + edere ‘eat’. Used formerly as a name for parasitic worms, the term here alludes to the sebaceous secretions resembling small worms that can be squeezed from blackheads.