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Thank you for using Just Answer. My name is Rebecca; I am a veterinarian. Please give me a moment to type my answer.
I am sorry to hear you found this lump on Jazzy's jaw. Is it painful to her?
The only way to know what a lump is, if it is serious, if it is cancer, if it needs to be removed or left alone, is to do some kind of biopsy. You can't tell what it is by feeling it, or looking at it.
I usually start with FNA, fine needs aspiration which means inserting a syringe into the lump to get cells from inside it, to examine microscopically. That should tell you if this is benign and can be left alone, or if it is possibly cancerous, and should be removed as soon as possible.
That is good. If this were an infection, or an inflamed tumor, it would be painful. Still, the only way to know what it is and how best to treat it would be do to FNA.
I have not heard back from you; I hope you were able to see my response. How is Jazzy doing?