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Hello, JACustomer. I have been a Veterinary Nurse for over 15 years and would be happy to help you today. I'm reviewing your question right now.
1) Is she inside only or outside, too?2) How long did it take for this area to develop?3) Any other animals in the home, particularly cats?4) Any hair loss or oozing from the area?5) Can you share pictures of the area?
Thanks for the additional information.Can you share pictures of the area?When were her last vaccines performed?
I do not believe this is food related. Can you tell me where on the back it's located? I'll be happy to answer your questions, but need more information to be able to best assist you first.
There's potential for this to be benign. You're making the right decision in taking her to the vet. This area is commonly used for vaccines and tumors can develop there. As well, as can see abscesses but these tend to be faster growing and usually happen in the presence of other cats due to scratches or bites. I think your best bet is going to be an examination and talking to your vet about a fine needle aspirate or surgical removal to determine what type of growth this is. Dogs tend to acquire fatty tumors (lipomas) more than cats, but the potential does exist for this to be precisely what you're seeing. If so, your vet should be able to determine this on examination and with a fine needle aspiration and cytology.
Sure thing. I hope all goes well. Good luck!