Just wanted to post a PM that I had with Dr. O on burn treatment in case anybody else ever needed the info.
From Dr. O:
due to the color changing nature of chams, I have found that its very difficult if not impossible to judge the severity of a burn for several weeks. sometimes there's a color change but it all gets better, and sometimes it continues into a full slough.
however, silver sulfadiazine (SSD) is my favorite topical by far for reptile burns, there is nothing better. I would keep a relatively thick layer on it at all times, enough that you may only need to reapply every 12-48 hours or so as it naturally rubs off. but it will help to keep bacteria dead and out, and moisture in. if he sloughs however, he will need systemic antibiotics for a month or longer, and you're going to need a vet for that.