I'm sorry, I wish I could be of help, but I have zero experience with tortoises. I don't know what state you're in...when I lived in California, there was a fairly active
turtle & tortoise rescue group...have you tried to search for such a group wherever you are? I do recall that tortoises often have a contagious RI like this, & should
never be put back in the wild (where it can spread & make the healthy wild populations sick too), but I don't know what if anything you can or should do for it as far
as care.