A. How did your vet know this wasn't cancer? Was a biopsy performed? I'm asking because what you're describing sounds like possibly an immune mediated disease that cats get called eosinophilic plaques. It can attack pretty much anywhere, but it's common to see on the head and ears.
Talk to your vet about performing a biopsy and getting a definite diagnosis. It should be pretty easy to do with a local anesthetic, and then a pathologist can tell you what this is. If it is eosinophilic plaques, then the treatment is usually immunosuppression with drugs like Atopica, but you need to know for sure before trying any treatment.
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