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A whitehead is a collection of sebum and keratin that plugs the opening of the pilosebaceous unit (skin pore) and imbeds itself in the follicular canal under the skin so that it looks like a raised, white bump. It is also often called as a closed comedone. The whiteheads appear in the form of tiny, pearly, white raised spots. They are common on the area just above the cheekbone, nose, or where the skin is fine.
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