I'll post a link to what dr. Cheng our MH Vet has to say abaout this disease.....
I will also say that turkey is no different than chicken, they are both poultry. Its usually advised to feed canned 'grain less' variety of vension or duck. my cat would eat neither and I had to temporarily feed him a fish diet...
only use steroids if absolutely necessary, I would try every other choice first. and if it does come down to medication a med called ATOPICA is much safer than prednisone or prednisolone....if you need more info on that later I can supply it.
flea collars aren't the answer b/c if it is an allergy to flea bites it could have been from one initial bite that happened long ago...thats the crazy thing with allergies.
try the food change, eliminate plastic bowls and eliminate all dry food. change the litter you are using. and just incase it could be enviromental allergies STOP using ALL scented products including cleaners, candles, room freshners, carpet products..anything.scented (litter included)...no perfumes. I wash my floors with a vinegar/water solution only.
try everything...this poor kitty looks as though he has a real bad case and must be terribly painful....-(