Adults can suffer from acne as much as teenagers. But what causes it? Normally its is caused by the oil glands starting to expand which leads to a build up of sebum on the surface of the skin. The hair follicles can become blocked by this excess sebum, as can the pores in the skin as well. The growth of bacteria can then occur which can spread around different areas of the skin resulting in an acne breakout. This breakout can often affect people in various different ways which also doesn’t help in learning what the exact causes of acne are.