My sister has been on chemo for nearly 20 months... pill form for 18 months and IV every two weeks for the last two months. She recently finished radiation as she has an inoperable brain tumor that is cancer. She broke out into a rash that is non itchy, non raised, and almost looks like flat blood blisters. They cleared up some and came back this morning, only now much bigger on her chest and all around her stomach, back and shoulder. Could this be more than just an iron deficiency?