While acne is not known, there is a broad understanding of the biology behind it. The main cause is a fatty substance produced by our body called sebum whose function is to help keep skin and hair lubcricated. During the years of adolescence, the body can then excess sebum combines with dead skin cells and clog pores. The buildup of oil underneath the skin on the surface of these clogged pores, creates an environment where bacteria can thrive. When these bacteria form, the skin becomes red and inflamed and causes what we call a pimple. Excessive production of sebum, the substance is produced by testosterone. While this is a male hormone is present in both males and females. During puberty, the body begins to react to testosterone differently and this new reaction is what makes the skin more fat. In the 20s, the body of most people acclimated to the presence of testosterone and acne problem disappears. Acne has been shown to be hereditary to some extent, but there is no compelling reason that some people are affected, while others are not. Some factors seem to be stress, diet, skin type, and certain medications. Some of the medicines that often contribute to acne problems are anabolic steroids, halogens, androgens and lithium. Factors related to the diet appears to be primarily related to skim milk-based products. While many people associate chocolate and greasy foods with grains, in fact there is no evidence that they are actually related. It is tempting to "pop" of grain, but in reality this can lead to a more serious problem. Squeeze the grain can cause the bacteria to spread to surrounding skin, which can lead to more pimples. Moreover, squeezing them can lead to scarring of the skin, which in the worst cases can be permanent. Even the simple – and often unconscious – an act of touching the face can be a factor in acne. Our hands contain oils and bacteria that can cause additional problems for people who suffer from acne. This extends to everything that comes into contact with the face – telephones, spectacles, sunglasses, hats, etc. Anything that could potentially lead to bacteria may ultimately lead to a more serious acne problem.