My mother has finished her chemotherapy in 13th february. She had 4 AC chemos followed by 4 paclitaxel chemotherapies. She will receive radio therapy from Tuesday 27march. Her due date of radio was in 18march but for some unavoidable reasons doctors delayed the date of radiotherapy. Her right breast has mastectomy. and now the right hand has this kind of red rash on skin. What can cause this?? I am very afraid.