Nothing scientific here, but I once took a long deep slice across the bridge of my nose. Really needed stitches, but I was stubborn. Once I got the bleeding stopped (took 'bout an hour, with lots of cold water compresses), I gooped on some Neosporin, then a little bandaid, and went on my way. Healed up fine, not even all that much of a scar (compared to my other scars at least)...