I am 23 years old and had TMJ for many years of my life that caused the muscles in my jaw to enlarge. I am actually on the underweight side according to my BMI but my face looks so unchiseled and round. I was looking into chin lipo, buccal fat removal, chin filler possibly. I didn't see much of a difference when I got 40 units of Botox a year ago, it was more of a physical release of my jaw but maybe I should get more?