What is a closed comedo?

Dr. Mehmet Oz, MD
Cardiology (Cardiovascular Disease)
A closed comedo is a raised, clogged pore. The plural of comedo is comedones, and they are also called whiteheads. Whiteheads occur when dead skin cells mix with sebum, an oily substance produced by the skin's sebaceous glands, and plug the pore, closing the opening. Acne is characterized by whiteheads, blackheads (also called open comedones), and inflamed red pimples or "zits."

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.