One would have to see your baseline to really determine how best to proceed. It's not just that there's more fullness on the left side, but also a greater curvature where the white lip meets the red. This upturn gives the appearance of a shortened "white" lip which magnifies the...
Chrissfirst of all, you must understand that everybody has some asymmetry in their face. Goldie Hawn has a grossly crooked but adorable smile, didn't hurt her career! If it bothers you, a combination of fillers and possibly micro-liposuction of the jawline may help. Seek out a board certified...