From your waist to your kneecap.. Wow, I need to see a picture of that. What in the world were you doing for that to happen. I once had a circular saw kickback while cutting some wood and the blade ran up my leg. I wrapped it with a towel and drove myself to the emergency room where there were lots of people with colds and stuff waiting to be seen. The nurse asked me why I need to see the doctor and I told them what happened and they freaked out. They immediately made me lay down on a gurney, and started an IV of fluids. While they were blotting up blood with gauze I asked if they wanted to see it and they said, "Leave that towel tied around it until the doctors get here, IDKY. Then they started rolling me into a surgical room and I asked, "What about all those other people who were here before me" They looked at me in disgust and said, "Do you WANT to lose your leg?"
After that I shut up and let them save my leg. Cool scar though. But do what you want to do, it's your life.