Hot Spot Remedies

I have a lab/chow mix. With age he was constantly getting hot spots he would not leave alone. I tried everything the vet offered with no avail. I met this very knowledgeable women that runs an animal holistic shop. She recommended that he is a hot dog (no pun intended) that he needs cooling foods. He is now on a diet of ocean fish kibbles and moist canned ocean fish, cooked sweet potatoes, applesauce and rice. Sometimes when I give him some people food, which I shouldn't, he does get flare ups. The absolute quickest way to get rid of the them is dab some dry cornstarch directly on the hot spots. They dry right up and he leaves them alone!