I am twenty something years old and experiencing acne for the first time in my entire life. It only appears on my cheeks. Visited my dermatologist and my allergy test came back negative and the medicine she prescribed worked for a little while. Then my lips began to swell then I had to stop taking it. Also, for the past two months my period has been irregular. Haven't been busy for almost a year so it's definitely not pregnancy. I don't know what to do at this point. Any ideas or remedies?