I had a single stitch pop open that resulted in what looked like a 1" or so "tear" in that location. (That's one of the parts of the skin that's under the highest tension post-op, between normal movement and dilation, so tears are more likely there anyway.) The stitches were supposed to all be dissolved within two weeks, but that one only lasted about a week, which was annoying. However, it did heal cleanly and without a scar. You probably should consult with a medical professional - a local one if the original surgeon is out of the question - to be sure that it's not excessive and doesn't need to be re-stitched, but it will likely be fine.
