com·​e·​do ˈkä-mə-ˌdō How to pronounce comedo (audio)
plural comedones ˌkä-mə-ˈdō-(ˌ)nēz How to pronounce comedo (audio)
: a small bump or blemish on the skin (as of the face or back) usually containing a plug of sebum in a skin pore: such as
or open comedo : blackhead sense 1
or closed comedo : whitehead

Examples of comedo in a Sentence

Recent Examples on the Web Open comedones, or whiteheads, are a result of abnormal collection of sebum (oil produced by sebaceous gland) and keratin (protein produced by the pore) in a pore under the skin, adds Dr. Kobets. Andi Breitowich, Women's Health, 25 Apr. 2023 The friction of the mask can also block and clog pores, leading to the formation of comedones or blackheads, says Dr. Suozzi. Leah Groth,, 15 May 2020 There are two different types of comedones: Open (blackheads) and closed (whiteheads). Renee Jacques, Allure, 25 Apr. 2020 Really, only when your pores have developed comedones—blackheads or whiteheads. Sarah Jacoby, SELF, 23 July 2019 So why are some people more prone to closed comedones than others? Sara Coughlin, SELF, 1 Aug. 2019 So, in an attempt to figure out if that was true, scientists developed ways to measure how many comedones a particular ingredient or formulation was likely to cause. A.a. Newton, SELF, 8 Aug. 2019 The trouble with comedones begin when dead skill cells get trapped inside the opening, and then slowly clogs up the hole. Sarah Kinonen, Allure, 5 Oct. 2017

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'comedo.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History


New Latin, from Latin, glutton, from comedere to eat — more at comestible

First Known Use

1730, in the meaning defined above

Time Traveler
The first known use of comedo was in 1730

Dictionary Entries Near comedo

Cite this Entry

“Comedo.” Dictionary, Merriam-Webster, Accessed 21 Apr. 2024.

Medical Definition


com·​e·​do ˈkäm-ə-ˌdō How to pronounce comedo (audio)
plural comedones ˌkäm-ə-ˈdō-(ˌ)nēz How to pronounce comedo (audio)
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