I just wanted to comment on you use of the term "Indian Fire". I haven't heard that in a long time. Must be a southern thing

(I grew up in River Ridge and spent a good bit of time "behind the levee") In my early teens I developed a very bad case but on my hand, specifically between my fingers. I had contact dermatitis (small clear fluid filled blisters) that I kept scratching at. I know...it was not a very pretty site. Honestly, I do not remember what I used or how long it took it to heal.
Sorry I couldn't help...stay with the dermatologist....they should be able to help you.