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I'd be happy to have a look on some pictures if you please send them
Have your vets done any kind of testing for this lump in the past?
Is there any chance you can attach some pictures?
Based on the information you provided and having had a look at the picture, I strongly recommend Molly gets seen for a hands-on consult. She's definitely been licking the lump, looks burst and infected. My best recommendation would be to call your local vets and try to book an appointment today, as Molly will require antibiotics before we can do anything else with that lump. If you have a buster collar, please put it on as soon as possible, to try to keep Molly's mouth away from the wound, till she's seen.
In terms of further investigations (after we clear that infection), there are a few tests we can perform as vets to identify the nature of that tissue. The minimum invasive one is called FNA (fine needle aspirate), which basically in the consulting room the vet pops a needle into that lump, takes a tiny sample, and examines that on a slide under the microscope; unless it's a fatty lump or a very obvious "bad" news, this option gives us very limited information. The second option would be the biopsy, but it requires a General anesthetic; this option gives us enough information to know what type of structure we are dealing with and what's the next best step forward. The third option is called excisional surgery, basically, remove the lump and send it to the lab to be analyzed; this is also done under General Anesthesia.
Given the rapid growth of this lump, I would probably want to take things step-by-step: FNA > Biopsy > Surgically remove it (+/- chest X-rays at the same time).
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