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Hello and thank you for your question. I am a Veterinary Nurse with over 15 years experience and I have assisted in the care of many pets with this particular medical concern. It would be my pleasure to assist you today. Is it possible for me to obtain some additional information from you about your companion?
1) When did this lump appear? 2) Can you share a picture showing this location? 3) When was your companion last vaccinated?
Typically I would be concerned about a vaccine reaction, but 5 years is plenty of time for something like this to have resolved if it was related to vaccines. At 13 years of age, we do need to be worried about cancer. It's not uncommon for elderly cats to have bumps here and there and if it isn't growing in size or appearance, it may be satisfactory to wait and watch to see if it changes. I would still recommend having a vet examine it. Failing this, take a picture, keep close tabs on it and if you see any changes, ulcerations, growth, etc. it most certainly needs to be examined by your vet. At 13, he's not too old to have this removed now and a histopathology performed to determine what this is.
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