I have a 6 year old black maine coon cat. He at one time had beautiful long black fur. After having a bladder issue where they had to shave his belly for an ultrasound, he has developed a problem with licking and scratching. He is completely bald from the legs all the way up the sides of his body. The vet said that he was dealing with allergies. He has had numerous shots to help relieve the symptoms but they are not working. I give him once a week oatmeal baths to cool his heated inflamed skin. Is there anything else that can be done for him. I was told the benadryl will help him a little.