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The skin contains many tiny hair follicles, or pores. Each pore contains a hair and a multi-lobed gland called a sebaceous gland. Sebaceous glands produce an oily substance called sebum, which normally travels up the pore to lubricate the hair and skin.

Acne develops when a pore becomes clogged with excess sebum and dead skin cells. If the pore is partially clogged but the pathway to the skin's surface remains open, the dark surface of the ... more