I would suggest that you take your cat to your veterinarian for a diagnosis since treatment would vary depending upon the cause. Derma-IonX would help to give relief and help to start healing the skin, but you might need to do something else to kill the offending agent that has started this process. We might be able to help you with that or give you some suggestions once we know what you are dealing with. Our Defendex shampoo is soothing and helps to kill fleas and mites and can be used just to provide extra relief. Please let us know what you find out.