As the ENT surgeon this comes under our domain there can be many reasons for this one of the most common reason is the facial paralysis other common reasons are any mass defect which is causing this is asymmetry as well as some muscular conditions like hypertrophy of masseter muscle is the most common cause of facial asymmetry. For exact diagnosis I need a image of your face so that I can comment on the actual problem You had not mentioned since how long you are having this problem is it in increasing is there any pain is present

It’s more like a cosmetic issue than health . It can get change you can consult me directly on app