Why Acne?

Acne is a subject that most people are aware of without any in-depth knowledge. For instance, we usually associate acne with teenagers going through puberty, but it can have an effect in later life too.
The basic cause is blockage of the follicles and can be seen primarily on the face, the back, chest and upper arms. Why it is that some people are affected more than others is not clear but could be linked to genetic makeup, stress, ingested medication (including steroids) and factors affecting hormonal activity.