Chin implant problem one year on. Any advice?

I had a large Chin Implant placed under chin a year ago. I had steroid injections a couple of weeks later as I had ‘ burning’ sensations & pain on right side. The implant looks fine, and fits face great but it just feels so tight. When I make certain movement with my mouth I can feel a ‘pulling’ and muscle contraction like sensations. It feels uncomfortable like it’s too big for my skin & sore on the right hand side. Can anyone suggest as to what the problem may be & what can be done to help?