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I am sorry you are worried about Mr Pibb.
Is the lump soft or hard?
How long is it there?
Is he eating and eliminating normally?
After your reply please give me a few minutes to type detailed answer.
I was hoping to hear right back from you so we could talk about your boys lump. If it is just under his skin and you can move it it is most likely a harmless lipoma.That is a benign fatty tumor that commonly forms on the chest:http://www.petplace.com/article/cats/diseases-conditions-of-cats/cancer-or-tumors/lipoma-in-cats
if it is in the flesh and swollen, it could be an abscess. That forms in the case of a bite o injury.
A growth that is attaches to bone may be a cause for concern and should be evaluated in person by a vet.
Please reply with more information so we can discuss this further.
I hope it is nothing and Mr Pibb will be just fine.
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