My neurosurgery PA missed about four stitches. I found most of them within a 2-3 weeks and a friend removed them for me. I did have a bit of thread come out at about 5 months.
This is not uncommon for stitches to work their way out.....for some it is bcuz they have EDS and they r rejecting them..while with others they just may be missed when the others were removed.
Ur NS is the best one to address this and say which issue u may have.
The same thing happened to me. I went to TCI for my 6 month f/u and 2-3 stitches were still in the incision site and skin had grown over them. Dr. B. sent me right away to a plastic surgeon within minutes of his office to have them removed. He was concerned about the possibility of infection.