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Acne Causes
Acne begins with the changes of puberty, and is due to the change in the hormones. It seems that it is usually a case of the skin over-reacting to the hormone levels, rather than there being particularly high hormone levels in those people who get bad acne.

The glands produce too much of their oils (sebum).

There are tubes (ducts) that run to the surface of the skin from these glands. Too many of the cells lining the ducts are produced.

This leads to tiny plugs blocking the ducts.

The glands continue to secrete, leading to swelling behind the plug.

The blocked ducts become infected with a germ (Propionibacterium acnes), which leads to inflammation and the production of larger redder spots, sometimes filled with pus.