Please see referance: It is a big topic, so please review this site. It is an inflammation of the oil glands over the face chest and back primarily. Hormonal factors play a big role esp. in teens. Young adults may have other factors contributing to this and will need some further evaluation. https://www.aad.org/dermatology-a-to-z/diseases-and-treatments/a---d/acne
Answered 7/6/2015
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