The lip reduction procedure is performed under local anesthesia on an outpatient basis. Surgery may be performed under general anesthesia if you are undergoing multiple procedures, or if you feel more comfortable being unconscious during your procedure. During treatment, the plastic surgeon creates a horizontal incision on the inside of the lip. The surgeon then removes excess fat and tissue from the lip before closing the incision with stitches. The lip reduction procedure can be performed on the upper and lower lip to improve the patient's appearance and balance out facial features.