It is not abnormal to have some tightness and numbness after a chin implant. I would recommend following up with your surgeon regarding any immediate post-operative concerns, as he/she knows the details of your procedure and will be able to advise you. I hope this helps, and I wish you the best of luck.
The sensations of tightness, numbness, itching and warmth are not unusual to feel after placement of a chin implant. Normally, these sensations should improve over time, as it seems yours are. If you feel anything is worsening or not improving, you should contact your surgeon prior to your three week follow up appointment.