Can someone identify this white protrusion on my tinfoil barb?

[tobysmurf]

This fish has been in one of my fresh tanks for about three years. I've never noticed this bump before, but that doesn't mean it wasn't there the entire time. Water conditions are great, although he gets a lot more water flow than most barbs would as he's in a tank with Berdmorei Botias. He has LED lighting and a good food supply. Anyone have any idea what the little bump could be on his belly? It only concerns me because the fish has been acting very agitated lately. He's about four years old and about 9" long from head to tail if that puts the bump in perspective.