How much does it cost to treat a cat with Pemphigus Foliaceus?

My cat has been having symptoms of this rare skin disorder but I’m pretty certain he does have this condition as his claws and nose are affected and we have tested and treated him for everything else and it has only progressed. I was wondering on an estimate how much it would cost to treat him. I have caught it very early if anything as it mainly only effects his nose, a small part of his ear and all of his claws which have mostly cleared up with this foam stuff and a steroid they gave him as well as an antibiotic. His fungal came back negative and my other cat has none of the symptoms he has.

How much does it cost to treat a cat with Pemphigus Foliaceus?
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