i need answers on allergy with a cat?

[finicky 7]

piper is 2 1/2 years old we have taken her to vets and dropped alot of money each time we go we have had her tested for what she is allergic to this has been going on for months she still is scratching to the point of she is all blood from her head down to the back of her head we have tried benadryl and prednisone and changed her diet what else is there please help

[kath]

what diet is she on? has she been deflead? has anything changed recently ie from when this problem started? has she had frontline used on her? sorry about questions but to help the answers are important. you can email me the answers if you want. several of my queen's kittens are allergic to frontline and develop these symptoms when its used.