I have one side of my lower face plumper and harder than the other. How to fix this! Bruxism? (Photos)

So i have a harder lower jaw side which feels like a "lump" (pointed in the pic). I have been told that it could be due to the muscle being overworked on that side as i grind my teeth but the other side is soft, is it possible that it could be due to bruxism? I wear a nightguard will the muscle "dissolve" overtime. What treatment is possible to even my jawline, its more obvious when i smile and my chin seems abit longer on the soft side. I have lost weight and i am 23 by the way.

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