How to take care of a burn?

So i burned the inside of my lower leg on my bf motorcycle's muffler it's been a day or so already still really hurts and sore it's about 2 to 3 inches in diameter the first night i couldn't wrap it so the blister opened up now it's kinda of scabbed over i don't know weather to leave it alone and let it breath or keep it wrapped all the time or should i maybe wrap it just at night please need suggestion's