I had the same thing - it is the internal layer of stitches that are breaking up - it is normal, according to my surgeon (he said there were three layers of sutures). His advice was DO NOTHING - Don't pull on them !!. I put a bandaid over mine, and as they dissolved, they fell out.
You could call the office to ask as well. I got the same story when I first called. It may get interesting later as well - I had some random loose fragments under the skin that gave me quite an itching sensation at about three months out, but they eventually came to the surface and fell out.