Hello KS12321, thank you for your question! This may be a case for both botox and fillers, or many other services. It would be important to do a full facial evaluation to determine what is causing the asymmetry- is it buccal fat, the masseter muscle, the mandible itself, or perhaps something else entirely. In our practice, we do such an evaluation followed by an in-depth discussion of various modalities such as toxin, filler, radiofrequency, and more. Be sure to find a provider who will be thorough from beginning to end. We wish you the best of luck in your search! Best, Genie Alexander, RN BSN, for Dr. Anna Petropoulos MD FRCS, Center for Classic Beauty Boston, Danvers MA