While it is possible to improve a FUT scar with FUE grafts, there are some special considerations to keep in mind: Grafting into a scar can lead to uncertain results. Some dense scars lack blood supply and will not support a graft to grow. The circulation can be tested by your hair restoration surgeon by numbing up a small area of the scar and seeing if sterile pin pricks will cause bleeding. I also like to inject scars I treat with a steroid solution to soften them up to help them support the new hairs.Is it worth using FUE grafts? Until cloning techniques become available and we no longer are limited to our current supply/demand considerations and restrictions of hair restoration procedures, each graft you use to fill a scar is a graft that you cannot use elsewhere. Some FUT scars are quite large and some guys have multiple scars, so to place hairs into all the scars can easily eat up quite a few grafts. While this may be a good option if the scarring is your main concern, however if you have thinning elsewhere, you may want to use the limited donor hairs you have left to address that. There is no right or wrong answer here.FUE placing is not the only option. As some of my colleagues have correctly pointed out, SMP is often a good option for FUT scar masking. It's important you go to a an experienced SMP artist who uses proper SMP pigment. SMP is much less expensive than FUE revision and does not limit an FUE revision later if still desired.