I have these bumps on my cheek that keep reappearing on the same exact spots.?

they start out where my cheek is tender , then withing 24hours, it becomes swollen , then puss begans to appear, I dont even stractch it and this happens, it hurts really bad to sit on , ive tried using heat pad to make go away, ointment, soaking in hot water, and everything! Im not a dirty person at all, I normally bath @ least 2times a day. This has been appearing now for 6 or 7 years. the doctors dont know wat it is, and its really embarring b/c i cant even wear a bikini bottom like other girls my age, ya know? .. ANY HELP WOULD BE GREATLY APPRECIATED! could someone give me some type of pointerS? i can also give more details if needed.