people here are promoting products???? There is a clinical practice guidelines for doctors on acne. You can try to read into it.

http://www.acadmed.org.my/view_file.cfm?fileid=474
http://www.acadmed.org.my/view_file.cfm?fileid=499

My advice is, if you think your acne is serious, please see a "real" dermatologist rather than seeing a normal doctor or buy medicine yourself. You will save yourself a lot of potential trouble.