Don't stress 2cheekymonkeys. As Kim said stitches come in all colors and sizes. I work in a hospital and have seen blue, black, purple, green, white and clear so far (and I wouldn't be surprised if there are others.) I'm 99.9% sure your stitches would all be dissolving ones, especially as your hospital follow-up is not until 6 weeks post-op. it's very common to use different types (and colors) for internal and external stitches. Some dissolving stitches are completely buried under the skin so you'll never see them as they dissolve and others that stick out can come away as the internal portions dissolve like you've noticed. There's no harm seeing your GP for reassurance if you're worried.