How Can You Tell if Your Chin Implant Has Shifted?

It sounds like the edge of the implant has buckled and lifted slightly off the jaw bone. This is something that is usually felt but not seen from the outside. This is fairly straight forward to correct if need be by repositioning the implant surgically through the same incision to allow the edge to lay flat against the bone. Typically, this can be done under local anesthesia with some light sedation.
The implant itself really should not be palpable under the skin and should feel as natural as your own jaw bone. In fact most patients forget they had the implants placed since they feel so smooth. It does not sound like an infection which would present with Pain, Swelling, and redness over the area. Hope this helps.
Dr D.

You can tell if the chin implant has shifted by manual palpation of the chin. You can feel the tail of the implant out of sync with the opposite side. It is extremely rare for both tails to be shifted. The implant is normally placed underneath the periosteum of the chin area and when placed in the proper anatomical position should not shift, move or migrate. A sign of infection would be if the chin is red, hot, tender, swollen, and painful after the implant is placed. If that is the case, the implant simply has to be removed. Removal of the chin implant can be done under local anesthesia and takes approximately 20 minutes to perform.

Your description notwithstanding, it is virtually impossible to give you a good answer to your question regarding chin implant shifting without examining you. A brief examination by your original surgeon or by another competent facial cosmetic surgeon would give you the best answer as well as an opinion as to whether or not anything should be done.