I had my wisdom teeth pulled 3 1/2 weeks ago and the holes were stitched up with disolvable stitches. Thing is they are still there, is this normal?

I thought they'd be gone by now! One is very tender, it hurts when I touch it with my tounge, the others are ok but just annoying. Does anyone know how long it usually takes for disolvable stitches to actually disolve?
Thank you,
Cherylle