Most of us have dealt with acne during our teenage years. Acne is, in itself, an accumulation of fatty liquids underneath our skin, creating bumps that can look irritated or swollen or even get infected. Teenage acne is caused by the sudden increase of horomones in our bodies; one of the consequences of this new level of sexual hormones is the increase of fatty deposits under our skin, and as a result we get more acne.
This type of acne often goes away by itself by the end of puberty, and it can be treated with topic creams that make the skin more dry and less greasy. In the worst cases, acne can be fought with special antibiotics. However, some forms of acne are resistant to traditional treatmens, and/or last for longer than our puberty and into our adult years. If this is your case, you might have a hormonal imbalance that is probably caused by polycystic ovarian syndrome.