Undecided Question

How to care skin rash(eczema)?

I take care a client, she is a . Everyday I fallow the owner's direction use body powder on that client where she has the eczema. All the rash under her breast and abdomen between thigh, even the belly button inside. Everyday two times put a lot of the body powder on those place, but didn't very good work on her, recently even getting more worse. Please tell me how can I do better? Thank you!!