Should I be concerned about possible sagging, laxity or ptosis after chin implant replacement?

The size and length of time since the surgery have an impact on the amount of skin laxity following removal. If you place a larger implant or undergo a sliding genioplasty then there should be no laxity. If you elect to simply have the implant removed, there could be some skin laxity and sagging.

Generally, speaking, changing to a slightly smaller implant, should not affect the skin in terms of skin laxity, but the procedure may or may not give the results you’re hoping for.
These questions are much better addressed by your provider.
Best,
Mats Hagstrom, MD