Nobody is completely sure. Experts believe the primary cause is a rise in androgen levels – androgen is a type of hormone. Androgen levels rise when a human becomes an adolescent. Rising androgen levels make the oil glands under your skin grow; the enlarged gland produces more oil. Excessive sebum can break down cellular walls in your pores, causing bacteria to grow. Some studies indicate that a susceptibility to acne could also be genetic but my family all had lovely skin except for me so I am not sure about that!
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