Hi, do I have enlarged masseter muscles? I cannot tell if the heaviness on the bottom half of my face is due to having chubby cheeks or just having large masseters. I definitely do feel the muscle when I clench my jaw but I've always had a weaker chin/jaw. I recently had an implant and fillers placed in my chin. If I were to do Botox treatment would it cause my chubby cheeks to sag or jowl?