I did that just a few years ago... unfortunately it was so horrible, driving home I had the a/c on high to try to cool my shoulders, but the rest of my body was shivering. I stopped at the grocery (the only thing open that late) and though I knew better, I bought lotion as they didn't have any aloe gel. I woke in the morning in a pain I'd not known before. I dragged my sorry rear to the store and got some proper aloe gel. I was miserable for about a month but kept putting the aloe gel on and keeping it only loosely covered with light cotton or open to the air. Luckily I didn't scar, but I learned my lesson. Never sit in the sun all day with no sunscreen and never use lotion on a burn.

I've heard good things about vinegar, but never personally tried it.