The most common problem that we face at puberty is the appearance of acne on face, and body, too. Nearly 80% of the population aged 12 to 18 years has problems with acne. Those skin changes may also occur in infants. There is an opinion that acne occur due to the rapid activation of sebaceous glands. This problem occurs in adolescents of both sexes, usually between 13 and 15 years. It previously o... more.