I have a 13 week old pure bred golden retriever. He has one bump on his belly that looks like a pimple...Its raised and looks like it is filled with yellow pus. I have not noticed him itching or chewing at it. Does any one else have a similar experience with something like this? I am going to the vet tomorrow just for a routine check-up but I would like to know if its something I should be concerned about right now or if there is some kind of at home treatment I should use on it in the mean time. I have attached an image. Thanks so much for the help!