Derma-IonX, which is an oral homeopathic product, stimulates the enzyme systems in the body which reduces itching and inflammation, promotes healing of the skin, and helps with assimilation of nutritional components in diet and supplements. The supplements I use along with it include digestive enzymes, probiotics, and fish oil. Together with Derma-IonX it produces a synergistic effect for a faster response. It is easy to give since you can add it to a little canned food. It can also be used topically by spraying it if there are troublesome spots on the skin. I would also suggest that you give your cat only filtered water for drinking and bathing if your water contains fluoride. For the dietary modifications you might want to try a grain free diet for a while.
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