We found two pea size bumps on Coopers neck and they are rough on top like scabs. One has a "loose" piece on top that moves back and forth when you move your finger across it. He won't let me get a good look at them. They are right around where his collar lays sometimes. Any idea what these could be and should I be worried? My hubby thought it could be bumps from where he got his shots when he was a puppy. Thanks in advance for the help.