Sorry forgot to update! He's doing fine. No shed yet. no redness,peeling,pus, nothing. :DD
I ended up not bringing him to the vet because after a second soak I noticed most of the brown stuff came off...so I guess it wasn't a burn. Only a little bit is still left now, hoping it'll come out next time he sheds. Possibly dirt/dust from his cork bark or remnants of repti-bark bedding I used to use lol.
thanks for all the help though guys!