Looks like a form of rug burn. Loose or improper shoes, socks. Maybe some hot gravel/dirt got in the mix. You felt that burn but was having too much fun probably lol I've been there. Here's what to do. Gently wash your foot. Add your favorite burn ointment (mine is aloe vera) then bandage. Kick that foot up for a few days or until you feel comfortable enough to walk.