Acne is the most common skin disorder. It is a chronic inflammatory disease of the sebaceous hair follicles. Each follicle contains a fine hair and many sebaceous glands (the skin’s oil glands).
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Under normal circumstances, sebum, the oily substance made by the sebaceous glands, travels up the hair follicle and out to the skin’s surface. However, with acne, sebum is trapped within the follicle and skin bacteria multiply within the clogged pores. Acne develops on those areas of the skin where sebaceous glands are most numerous: the face, scalp, neck, chest, back, and upper arms and shoulders.
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