I thought we were doing well. The cat went for 1.5 years without getting bumps and scratching the bumps off when I changed his food to wheat, corn and soy free. Now all of a sudden, it's happening again. Nothing has changed to cause this. Any ideas or thoughts on this would be helpful?????I'm Calling the vet to get a shot to help with this but it doesn't help long term. I feel like it's the food again