I have a shih tzu maltese mix. About 10 years old. She has a lump on her back. It’s a bit smaller than a quarter. It’s red, and pops out like a big pimple. Any idea on what it could be? It’s been there for a while. She would constantly bite at it and eventually bit it off, it was left with a scab, but came back not soon after. Any knowledge on the subject would be very helpful.
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