Hi Suz-
It could be military dermatitis or a food allergy. Here is a link to information on military dermatitis. http://www.pethealth101.com/arthritis_and_joint/fattyacid.shtml - you should be aware also, that just because a pet does not go outside or because you do not see fleas, does not mean they do not have them. Cats that have flea allergies are extremely good at removing fleas from their bodies and putting her on a monthly flea treatment such as Revolution may solve the problem totally. Otherwise, you can try changing her to a non cornbased diet such as Felidae, Innova or Wellness. Adding the Omega 3 Fatty Acids to food as described above may also be beneficial. If none of these suggestions help, you need to take her into the vet for a skin scraping so a definitive diagnosis can be made. Good luck!
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Lori McLaughlin
Your veterinarian should ALWAYS be consulted first and foremost when your pet's welfare is at stake.