Knowing what antibiotics she was on will be helpful. And what about the antifungal, what was it?I think the first one may have started with T - it was milky white, and the second one definitely started with C and was clear.
Other possibilities are a vitamin deficiency, as there are several that can cause dermatitis, and the other possibility is a third mite, the scaly leg mite. Not 100% positive, but I think they can get them anywhere on the body.