When I was a kid I hit the back of my leg, near my ankle, with one of those old metal spikey pedals that came on 10 speeds. It put a big gouge in my skin, which bled for a while but I was able to make it stop. In retrospect I should have gotten stitches, because I have this decent sized scar. It shrank some as it healed over time, but it's close to what it originally was. So if you're concerned about cosmetics, I'd swing by your local ER.