My face/ jaw / cheeks are uneven, one side is larger than the other. How can I make my face more symmetrical? (Photo)

Hello, my face is not symmetrical, one side is a lot bigger and rounder than the other. I’m not sure if it is my jaw /muscle/ glands or if this can be corrected by surgery or injection? It is more noticeable when I’m smiling. If possible I’d like to slim the rounded side. I did not have this issue 6 months ago, I’m not sure how my face has changed so much. (Photos of before and after attached)