There are a few nonsurgical treatment options to improve lip asymmetry. One option is to consider injectable hyaluronic gel such as Restylane or Juvederm Ultra. Sometimes it is not just injecting the lip itself, but many of the supporting structures around the lip to help improve asymmetry. For the upper lip, these structures include the philtral columns, pyriform fossa, and the cutaneous upper lip. Another option is to consider skin tightening procedures such as microfocused ultrasound, Ultherapy, to the skin above the lip. This can help to stimulate collagen and results in eversion of the lip on the smaller side. I would recommend to consult with your dermatologist or plastic surgeon to determine which is the best option for you. Warmest regards,Dr. Peterson