does she continually lick as well. If so she is causing an infection on her skin, and has an allergy of some kind. Ask your vet for a blood test. My cat has cost me over �1000 for test sent to the US and treatment up to now. The result is an allegy. I have a list of all the allergys that were tested for and found out that he cant eat mice, rice, and many other things. He has to have cotton beds even i have to use cotton on my sofa and bed as he gets up there as well. My vet has put him on a course of a brand new medicine. It is 3 injections. one is a Hormone one an anti bacterial for the skin and the other to gradually get him used to all the things that he is allergic to.He is also on a anti allergic prescription diet. Each time he has a set of injections which is only when he breaks out it is longer and longer each time. Last time was 8 months and with each treatment it gets longer inbetween injections. He will probably have this all of his life, but if we can get it down to one treatment a year ill be more than happy.