[url=http://en.wikipedia.org/wiki/Propionibacterium_acnes]The actual cause of acne[/url]. Basically, as your hormone production goes up, the chance of your pores being blocked increases. When that happens, this bacteria (which normally causes no issues) grows so extensively that it causes acne. Acne treatments that kill the bacteria will stop acne, but they also remove the benefits that bacteria brings. Contrary to popular belief, acne has little to do with the cleanliness of the individual.