Originally Posted by
Tartan
If the seam is coming out, chances are it's frayed. I might slip a little strip of fusible under the edge and fix the edge and then hand sew it shut.
I doesn't look like it is frayed. It looks like there is no thread there. I would hand sew that small area closed with invisible stitches. Take just a thread or two from one side and then a thread or two from the other. With matching thread, this probably won't show at all.