Acne is a consequence of excessive sebum activity. There is so much sebum that the skin simply can not cope with its removal, as a result of clogged sebaceous glands, they become inflamed. In the dilated pores clogged sebum, when oxidized, it turns black. Such activity of the sebaceous glands is caused by hormonal background. The reason is the increased level of testosterone. And it occurs not only in adolescence, but also in adulthood. Read more here parisbeautyskinandspa.com/