What is the Minimal Hair Cut "Buzz" Size Needed to Cover a FUT Hair Transplant Scar?

You can usually cover a FUT scar with a #3 guard (sometimes a #2).  You can usually cover a FUE scar with a #1 guard (sometimes a #0).  Both FUT and FUE will leave a scar.  

In my opinion, a #3 guard length will not adequately cover your linear scar. To be satisfied with this method of surgery, I would advise you to try a longer hairstyle. A longer hairstyle will be especially helpful in the long run, as these scars can stretch and widen over time.

This varies a lot from doctor to doctor and patient to patient.  Even with a good doctor a scar can be very visible or a bad doctor can get a good scar.  You may also want to look into other options that are less visible.  These options include the Neograft FUE approach and the Artas robot hair transplant which are more available now. 

Unfortunately there is a great deal of variation in the scar after a hair transplant.  I have some patients whose hair is only half that length and the scar is not visible.  In others it may take a little more length to cover the scar. 

If you are referring to the guard on the clippers, the #3 guard will hide your scar quite well.  With the trichophytic closure, we have seen excellent scars in the donor area.

The length of your hair varies on the type of hair you have. Most of the time #3 guard with the clippers is fine. Some patients with thicker shafts of hair can go as short as #2 guard.

Some people produce no scars (like me) and others create wide scars. IF I wanted to closely cut my hair to a #1, I could, many people with wider scars can't.