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Hi, I don't know what this could be, there are many causes of growths from cysts, allergic reactions, infection, pus, or benign growths, which are common with older dogs. The only way to really say what it is is to have the vet look at it and diagnose what type of growth it is by doing an exam and maybe a biopsy. Is the bump hard or soft?, does it move or is it solid? I hope it isn't anything serious, sending positive thoughts and prayers your way.
Hi - thanks for the reply. It is soft and appears to be full of puss/blood. It has leaked on occasion. He had a smaller one awhile back. The vet suggested we wait and see if it went away (which it did). This one appears to be sticking around.