Just to clarify--is the burning from chemo or radiation? If radiation, that is often a side effect. My radiologist's office gave me two different free samples of cream. I'd start by asking the doctor's office first because they might suggest a combo or a thicker prescription cream. They should be responsive to the dry skin complaint. Plain aloe vera, either in tube or from a fresh leaf, also helped me. It sounds like your aunt might be feeling nothing helps, and as you say, skeptical. But there are stronger creams, and she might need to use frequently.