My cat Purple cannot stop scratching. I've given her Advantage, taken her to the vet TWICE for allergy shots and don't know how to stop her from tearing the skin around her neck apart. It's gotten to where it's bleeding. The last allergy shot was a week ago, and the advantage was given on April 10th. I'm seriously at my wits end- I can't stand to watch/listen to her scratch anymore. I've picked her apart with a flea comb and can't find a single flea- she's had her skin scraped for mites. Is there anything else I can do? An ointment I can try? ANYTHING!