RHA® 3 Versus Restylane-L® for Lip Augmentation

This is a multicenter, double-blinded, randomized, prospective, controlled clinical study to identify whether RHA® 3 is non-inferior to Restylane-L® for lip augmentation at Week 12 after the last treatment (initial or touch-up). At screening, the treating investigator (TI) will evaluate the subject's lip fullness using the validated Teoxane Lip Fullness Scale (5-grade) for eligibility of the subject for the study. At screening, the blinded live evaluator (BLE) will evaluate the subject's lip fullness using the TLFS to confirm eligibility and to establish a pre-treatment score for assessment of effectiveness. Enrolled subjects will be randomly assigned in a 3:1 ratio to either the RHA® 3 or the Restylane-L® treatment group. Subjects will be blinded to the study treatment. The TI will administer the fillers, and if necessary, subjects will receive a touch-up treatment 4 weeks after the initial treatment to optimize the results. If the touch-up treatment is administered, the subject will be asked to come to the site for an additional visit 4 weeks after the touch-up injection. The study duration was extended from 36 to 52 weeks once all subjects had already been enrolled. Nearly 60% of the subjects consented to extend the study to 52 weeks before being eligible for repeat treatment. All data are presented up to 52 weeks (as well as 4 more weeks follow-up after retreatment at 36 or 52 weeks). Subjects will be followed for 36 to 52 weeks after their last treatment (initial treatment or touch-up), at which point, they will be offered re-treatment with RHA® 3, regardless of their original treatment, provided that the TI deems the treatment to be appropriate and the subject agrees. Reasons for not administering the re-treatment will be documented. The subject will then be followed for an additional 4 weeks before exiting the study. If the subject or the TI declines re-treatment, this visit (36 or 52 weeks after the last treatment) will be considered the study Exit vis