Is it normal to have tenderness/soreness after eating, 4 weeks after a chin implant?

I had a chin implant 4 weeks ago. When I eat solid food, there is one spot on the right edge of my face & neck (in other words, on the bone) that gets sore. I'm not talking about eating corn on the cob or anything hard, but a sandwich or a cookie, etc. A few days ago, the pain moved an inch closer to my chin, again on the edge. As of today, it's gone back to the original spot. For what it's worth, pain medication (one ibuprofen) gets rid of the pain.