A. It could be an abscess or some type of tumor. The best thing would be to have your dog examined by a veterinarian to determine the exact cause. Your veterinarian can do a fine needle aspirate or biopsy, if needed, to diagnose and treat the problem. If it's an abscess it will need to be drained. If it's a tumor, it may need to be removed, depending on the type and how fast it is growing.
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