I've kinda got Wolverine's healing factor, I don't really get scars. Especially from burns. I mean, I once burned the crap out of one of my arms with one of those fry baskets from McDonald's, and it healed so good I can't even tell which arm it was anymore.
That being said, I do have two noticable scars:
One is on my knuckle from when I was moving a rug into the trunk of a car... but I wasn't really a kid at the time, so that doesn't count.
One scar I got when I was 9 is still around, however. I stabbed myself in the arm with cutting knife. Okay, let me back up. You see, this was RIGHT after I had seen Toy Story, and my parents had just bought me a Buzz Lightyear action figure (the big one with all the same features as the one from the movie).
However, the box it came it didn't look like a spaceship at all, so I wanted a spaceship for my new Buzz. So, I took a cardboard box and a cutting knife into the front yard and went to work on my new Buzz Lightyear spaceship. I think you can guess where things went from there.