Hi and welcome to PT. I'm so sorry to hear about your cat. I've never heard of feline lingual eosinophilic granuloma but I have heard of eosinophilic granuloma. This is what my Pearl has. Since she's been eating a grain free diet,Innova Evo, she hasn't had any more breakouts.

When she did have a break out, she was put on prednisolone for about 2 weeks and this cleared it up. I guess that her's is food allergy related so I'm glad that her diet is helping her stay healthy. Some vets love doing uneccesary tests. If I were you, I would go to another vet for a second opinion. Why did you decide to switch vets if your cat was being treated well by your original vet? I hope that you'll be able to get your cats illness under control again. Good luck.