I have a Sebastopol gander, named Sebastian. I ordered eggs off of eBay last spring and he hatched in March 2011. He has a tuft. The woman who sold me the eggs swears to me that he's 100% Sebastopol (she doesn't have Tufted Romans). For the past few months, a little lump has started forming under his "chin." It looks like a small dewlap. Inside of it feels like a firm lump, about the size of a marble. He acts and looks healthy. Should I bring him to a veterinarian?