Hi. Greetings. Please note : Acne is a common problem at your age. Reduce intake of chocolates, milk and junk food too. Use a topical retinoid cream daily night. You may need a short course of antibiotics. But don't take doxy for more than a month. Discuss other suitable forms of treatment with your dermatologist. Hope this helps. Warm regards. Dr Govind Suresh Mittal, Bangalore.