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.

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2. Whiteheads Whiteheads, aka closed comedones, are similar to blackheads except instead of being open to the air, the pore is closed off by a layer of skin, says McMahan. While it's tempting to ...

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