I have a scar that is about six inches long and 1/2 wide located on the inside of my bicep. I was working off the top rung of a 4 foot ladder, and tried to step off onto something else. I missed what I was going to step on, and fell to the ground. I caught the inside of the my arm on the corner of an electrical panel and ripped the top layer of skin off. Although it looked nasty then (and now), it didn't hurt or damage anything.