First,I have had this guy for over a year, eating good, acting fine. Water quality good, no changes or new additions to the tank. While feeding this morning I notice a small "pimple" if you will below the mouth.It is raised and not really white but appears in coloration with the fish and only really noticible looking at the fish from a side angle. The rest of the body o.k. as well as other fish. I will keep a close eye on this to see if there are any changes but any idea as to what it could be? Thanks in advance for responces.