All of the factors that affect acne are not completely understood. However the main cause of acne is well known. Excess production of an oily substance that helps keep the hair and skin soft is a prime ingredient. This oil is Sebum, during adolescence the amount of sebum produced by your body is greatly increased. This sebum when combined with naturally occurring dead skin cells can block hair follicles which then turn into an acne lesion.
Not only will this mixture block pores it also provides a growing environment for bacteria. It is the growth of bacterial that causes what is commonly called a pimple.
The male hormone testosterone is what causes your body to create excess sebum. Testosterone is produced by both males and females. During puberty the increase of testosterone causes the body to have an abnormal reaction which manifests itself with the excessive production of sebum. This excessive oil is commonly found on the facial skin, as well as back and shoulders. In most people the testosterone levels have normalized by the time they are 20 and any acne issues will clear up.
Recent studies seem to indicate that acne is at least partially hereditary. In...