Numbness After Chin Liposuction and Implant

If the numbness involves both sides of the chin, it might be simply due to swelling, stretching, and bruising around the mental nerves, particularly if the numbness is not complete. In that case, watchful waiting may be all that's required.
Cutting of the mental nerves on both sides, or complete numbness might well require removal of the implant to allow for some nerve recovery. Your surgeon will have a better idea of the status of those nerves since he was the one there at surgery. It's usually best to go with his advice.
Has it improved at all?

Numbness after either or both of these procedures is common, but temporary.  I would not rush to remove the implant until an adequate period of healing has happened.  Usually this is around 2-3 months, which allows for all postoperative swelling to disappear. If you are sitll numb, consider having the implant removed.

It is possible to perform a chin implant at the same time as liposuction to this area. If you have an area of numbness or odd sensation in your chin is possible that the chin implant may be touching or you're taking one of your mental nerves. At this time, it is best to let your surgeon know about your concerns so that they may determine if the implant is residing in the correct position. If the chin implant has shifted and is now irritating nerve, it may be necessary to perform a revision so that the chin implant remains where it should.