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I am sorry to hear you are worried about BJ. My name is Rebecca. I am a veterinarian and will do my best to help.
How old is BJ, and what kind of dog is he? A picture would help, if you could post one.
Can you take his temperature with a thermometer?
A swelling could be an abscess (infected pus pocket), infection, growth, or injury. Is it more red than the rest of his skin? Does it hurt at all when you touch it? If it is an injury, cool compresses (a bag of frozen peas wrapped in a towel works well) may help take down the swelling. If it is an infection, he may need antibiotics. The best way to know what any kind of swelling is would be to do FNA, fine needle aspiration, using a sterile needle to get cells from inside the swelling to look at under a microscope.
Let me know if you can send a picture, take his temperature, or any other question you have.
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