Q. My cat just had diarrhea on the living room floor and her ears are very warm and she has been licking her back a lot Wich is causing a lack of hair
DESTINI R. HOLLOWAY, DVM
A. Sounds like your kitty may have a flea allergy. Even 1 bite can send allergic pets in an itch frenzy. And we know that even after the flea is gone, pets can still continue to itch due to a phenomenon called the "itch cascade". You can try giving a Benadryl tablet @ a dosage of 1mg per lb. Most cats need about 1/4-1/2 a children's tablet (25mg).
Then a good flea preventative, I really like Revolution for cats. Over the counter Advantage multi can work also http://www.bayerdvm.com/show.aspx/productdetail/advantage-multi-for-cats
If fleas are not found and the skin itself looks relatively normal (I.e. No crusts, odors or intense redness) then licking in cats along with diarrhea can be a sign of anxiety. I can discuss options to help with anxiety if you believe this is more likely.