Ellie, the vet should be able to tell if it is a fat deposit without surgery and without anesthesia. I've had vets do this test on one cat and two of my dogs. It's called a 'fine needle aspiration' and they insert a syringe into the lump and draw out a tiny sample of fluid. They squirt it out onto a glass slide and look at it under the microscope. If it is a fat deposit, they can usually tell right away. The cost a few years ago for the FNA was about 20.00 and I think there might have been a cost for looking through the microscope but not much. No local anesthesia was needed all three times my animals got this test done and none of them seemed to feel it at all. It took about 2 seconds to do it.
Hope it's just a reaction to a bug bite though.![]()
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