Acne appears when the sebaceous glands malfunction. This brings about the blockage of small openings (pores or follicles) on the skin preventing the passage of sebum (oil). Because sebum, which normally lubricates the skin is thus blocked, bacteria develop and begin to grow. This is how whiteheads and blackhead are formed.
Source: Health and Fitness: Acne Articles from EzineArticles.com
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