Suggest Treatment For Burn On Calf From Motor Bike Exhaust

I have burnt my calf on a motorbike exhaust on vacation in Indonesia. it has been two days since the initial burn and the area which is 3x1.5 inches has a large blister covering it. I am up to date on wall vaccines but the outside edge around the blister is a bit red. Right after the accident I went to a very basic clinic and got it cleaned and dressed with gauze, but it is still very painful when it moves and the skin covering the blister is a bit spotted and brown. Does this sound normal or should I be seeking further medical attention? - thanks