What are the causes of oily skin?
Oily skin is caused by increased sebum production, which is mainly caused by hormones. Normal skin only produces as much sebum as it needs. With oily skin, however, much more of it is produced and the excess fat ends up on the surface of the skin. Unfortunately, oily skin is usually associated with other problems as it is often prone to blemishes. You can find out more about the origins and causes of oily skin here.