Recurring acne. If yes , which one?

Hi , It's been 5-6 months and I am suffering from pustular acne around my cheeks, jawline and occasionally on forehead .  This happened right after I suffered from mumps. Since then it's never stopped. Got my ultrasound done for pcod , but the reports are normal . Currently getting myself treated by a homeopathy Dr. I don't see any results because as soon as my acne starts getting better , within 3-4 days it gets triggered again .. every week my acne subsides for 3-4 days and again erupts . I exercise , even take care of my diet ,drink 3-4 ltrs of water everyday , but nothing seems to work . I suspect having an allergy due to something that I am either applying or consuming on regular basis .  Should I get allergy tests done ? If yes , which one ?