A friend who had open ulcers in her throat from a clinical trial recommended something called Healios Powder. It was created by oncologist.

Two other things rhat can help soothe - aloe juice, get it in the refrigerator section of your produce department. The other is honey in a warm liquid. It has been used for millennia to heal burns and wounds due to its high get antioxidant content. The darker the honey the higher the antioxidant content. Also, if you've had recent chemo, avoid unprocessed honey as some contain botulins.