Good call Eel. For some reason a pixie being exposed to Chytrid fungus never crossed my mind related to the skin abnormality. Doesn't seem impossible since most of this disease has been introduced by trade. I always thought pixie frogs built up immunity to this disease through adaptation, but would be a good measure of safety to start this frog on this regimen.

Great youtube video showing you how to treat a frog with Chytrid first hand:

How to treat for chytrid fungi. - YouTube