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Lumps can be secondary to infections (abscess), cysts, benign tumors, and malignant tumors to name a few. The way to diagnose the problem is to do either a fine needle aspirate or a biopsy. It sounds like the vet you saw did a fine needle aspirate. If nothing visible can out (like pus or fluid) then it is probably not an abscess or cyst. With solid masses you might not see any fluid but you typically get some cells to put on a slide and examine under the microscope. Did the vet do that? Usually the cells are just inside the needle but you can force them out with air on to the slide. I then stain the slide and look at it under the microscope to determine if I can make a diagnosis. If I am unable to make a diagnosis then I send the slide to a lab to be evaluated by a pathologist. If a diagnosis can't be made with the needle aspirate then a biopsy needs to be done and evaluated by a pathologist.
He really should be seen by a veterinarian to get the proper diagnosis and appropriate treatment. The mass should be aspirated again and then examined under the microscope. Did the vet think it might be a lymph node?
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Sorry to hear about your problems. I am not sure why the vet did not examine the cells under the microscope as that is the whole purpose of doing the aspirate. Like I said, most of the time it is a very small amount of cells that is obtained and usually not even visible within the syringe. Usually with an abscess you will get a purulent material in the syringe and then it will leak out from where the needle was inserted so it is probably unlikely to be an abscess. Did the vet just give your dog an antibiotic injection or did he/she also prescribe an oral antibiotic? Normally with an abscess it is lanced open so the purulent material can drain out and then the animal is put on oral antibiotics. A warm wash cloth compress can be used to try to get it to open up and keep it draining once open.
Is there anyway to talk to the vet at the emergency clinic to explain your situation and get his/her opinion.
If it is just some type of benign mass then waiting a little while probably won't make a difference. I would just monitor him for anything abnormal and take him sooner if needed. I would continue the antibiotics until they are done just in case it is some type of infection.
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I am glad that the lump is resolving and hope that it continues to go away. I hope that your health is better too. A lot of people don't understand the process on this website! Take care!