Have you asked your doctor to prescribe something for it? What type of chemo did you have? or was it
Erbitux? There are a lot of products depending on the type of rash and if your radiated skin is involved or not. I would first talk to the radiation oncologist and make sure that you will not be damaging the radiated skin with a new product. Mine insisted that I only use certain products for 6 months. Then see your oncologist to find out if it is related to your treatments. Also have your thyroid checked by your GP as dry skin is a symptom of thyroid issues.
If everything is ok I have very good luck with the Aveeno products. Also Eucerin, Lubiderm and the new Vaseline Intensive Care products have helped.
Good luck I know that it is miserable.
Patty