Huge facial asymmetry, very visible difference which came out of nowhere. (photo)

Few months ago my doctor realized that my right cheek is way bigger than the left one. And it was not like that before. I was checked by several doctor if it's not a cancer of salivary gland and few other things, and the final diagnosis is that is just a muscle. I was thinking today a lot and I just thought that when I eat, I only chew with my right side (my right cheek is bigger). Like literally, always. Could it be the problem? What doctor should I see? Sorry for bad eng.

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