Thanks for writing,Unfortunately your photo has an odd angle and there is only one view. The inequality is not uncommon, our body is not symmetrical. The cause can be muscle pull, red dry lip volume or even the bony fullness of your maxilla on that side. Physical examination face to face will tell the tale. Slight corrections can be made with filler if necessary, but you need to have someone do this who is great at injecting, typically not someone in a spa. Good luck Stephen M. Davis, MD, FACS Certified: American Board of Plastic Surgery Member: American Society for Aesthetics Plastic Surgery Member: American Society of Plastic Surgeons Member: RealSelf Hall of fame VERIFIED:Plastic Surgeon