I was also thinking that steroids would probably help with this condition. I know that the shots can be expensive but the pills aren't. I just bought 300 pills for Storm and he only gets 1/2 of a pill every morning so this should last him a long time. The cost was only $28. I buy chicken pill pockets and cut them into 1/4's and roll them up into little balls. I then use these to cover up the pill and he thinks he's getting a treat so it's very easy to pill him. When it's time for your cats to get another steroid shot, you might want to try the pills instead to see how it goes since it's much cheaper in the long run. Good luck.

My vet specializes in cats and I'm going to e-mail her about your situation. Maybe she's seen a cat with this before and she can give me some more information about treatment etc. I'll let you know.