The process of development of acne though known, it is clearly not known, why the process starts. The main pathological process is blockade of the skin openings of oil glands by keratin plugs near the hair follicles, the hormonal changes at the time of puberty. In fact, it is told that appearance of acne is indicative of puberty. The main problem with acne is disfigurement of face from the comedo, and scars following its rapture and healing. This can cause much embarrassment particularly to the young ladies and may also cause psychological problems. Read more; http://clinicianonnet.blogspot.in/2012/03/development-of-acne-and-its-management.html