There are several types of acne treatments available. You should choose the right treatment depending on your needs. Acne is a very common problem among teenage girls. It often occurs in teenagers and young adults, but it can also affect older people. Find out what causes it and how Acne is a skin condition that affects millions of people worldwide. It’s caused by clogged pores and bacteria build-up in the oil glands. The most effective way to treat acne is through topical medications.