Sebaceous glands: Your skin is embedded with tiny glands called sebaceous glands that secret an oily substance called sebum to lubricate and protect the outer layer of skin. Frequently, the opening of the sebaceous gland to the skin becomes blocked and a pimple forms as a result. Without going into different types, both blackheads and whitehead pimples are treatable with regular cleansing and occasional medication
Answered 11/4/2015
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