Acne has been associated with the bacterium Propionibacterium acnes which is usually found in normal skin. The increased presence of this bacteria may increase the risk for developing pimples or acne. Also "no one knows exactly what causes acne. Hormone changes, such as those during the teenage years and pregnancy, probably play a role. There are many myths about what causes acne. Chocolate and greasy foods are often blamed, but there is little evidence that foods have much effect on acne in most people. Another common
In terms of treating acne, this would depend on the severity of the acne and the likely cause. In most cases, topical medications like products containing benzoyl peroxide and salicylic