Chin implant sore on one side after only 9 months. Any ideas?

I had a silicone chin implant inserted under my chin 9 months ago and I'm still experiencing a soreness, like a burning sensation on the right hand side along the jaw bone. I noticed this the night of the surgery and pain increased until I had steroid injections 2 weeks post which helped. Right side also feels tighter and what I can only describe as a contracting muscle feeling.