At what grade hair cut is your scar visible? Without seeing it, it is hard to suggest what IMO could work. Can you not lift your hair up and take a picture with your back facing a mirror?
Failing this, there are a few options.
SMP to camouflage the scar.
Fue grafts placed in the scar.
Have the scar excised out with another strip surgery.
It sounds like you need another surgery to bolster/repair the first surgery, therefor FUE or strip surgery are both options providing a doctor deems you a suitable candidate.
When I had 2 strip scars I opted to have them taken out and the extra grafts that came with the excision were transplanted into my thinning area`s. These surgeries reduced my scars greatly, allowing me to have my hair at a grade 2 cut.
Have a few consults if possible, see what the doctors recommend would be the best approach for your situation.
If i was to go to a grade 3 it would defiantly be visable! I have had it at 4 before and some people noticed a line from when they stood behind me in the gym and bent forward to carry out an weight exercise. I was shocked as on a couple of occasions people have noticed and asked me and my reply was it was from an accident when i was young. I feel very self conscious now when people are walking, standing behind me etc
What is the success rate of FUE grafts placed into old scars? From my research i have read that they don't always grow due to poor blood supply to that area.
Also for this scar procedure would you have to shave your whole head? In my whole life have never had a shaved head and would dread the thought of doing it but do understand that for FUE hair transplants you have to go down to as low as 0 for any procedure to work. Also, i could never tell anyone as i just can't let anyone know as i would be mortified as not very good at dealing with my hair loss a just suffer in silence. Finding this forum and talking to you and other people has helped me lots with the questions i have about hair loss!
You mention having another FUT procedure to 'excision' the hair grafts into the scar but would this not create a second scar to cover up the first??
I will try and get some photos with the method you suggest using a mirror.
What is opinion on SMP into the scar area? I have read that it can have poor results and it does not last very long.
Sorry for the long winded reply. I really appreciate your help you give people on here. Thanks