My cat had the same problem. I took him to the vet and he said he a flea allergy but I always use revolution on him. The vet gave him a cortizone shot and an antibotic shot. He cleared up and his fur is beutiful now. I rub wheat germ oil on his skin if he starts itching again and it helps to make him stop. The cortizone shots cannot be given that often because it will harm him in the long run. He hasn't gotten a shot in two years and I think the wheat germ oil helps a lot. Hope this helps.