Will my skin go back to normal after chin implant removal? I only had it for 4 weeks. (photo)

I would agree with your surgeon that it is very unlikely that you will have any problems after removing a chin implant that had been in place only 4 weeks.  I would expect your chin to return to how it looked before the implant was placed.  It may take several months for all of the swelling to resolve before you see the final result.  

Don't panic.  At age 22 and having the implant only 4 weeks, you should have no problems.  You will mostly likely just have a small incision under your chin.  Your tissue will shrink back!