Ugh and ouch. Those hurt. You can apply some ice to the area which will help reduce swelling. And then you treat it like any other burn. Aloe vera works well-- they make a gel form. You could try otc hydrocortisone too. I'd consider covering it if it is oozing. As it heals you will want to be good about keeping it out of the sun. And you can take ibuprofen for pain. How long it takes to heal is really dependent on how bad the burns are. If they are bad, I really recommend you see a doctor. Scabs indicate the healing process has stared but you do not want scars. good luck