Acne is a common problem for teenagers but it can often be bothersome even into the adult years. Acne is a skin condition that occurs when pores in your skin become clogged. Pores in our skin contain a hair follicle and an oil gland, when these glands over-produce oil (sebum), the pores become clogged. Pores can also become clogged with the buildup of sebum, dirt and bacteria.