Please either post a link to the photo or post it.
just give us a detailed description: how long has the bump been there? How big is it? How quickly is it growing? How long have you had this particular fish? Is the fish eating and swimming normally? What other species of fish are in the tank, how many fish and what size tank?
He is eating and swimming normally, I have had him for several years. I noticed the lump a couple of months ago, at first I thought maybe he had bumped against a rock and that it was just an abrasion. It has since gotten much bigger. I have two dolphins, 3 OB zebras, a gold foil barb, a bala shark, and 2 plecos in the tank as well. It is a 55 gallon I have 2 305 fluvals for filtration. All the parameters are normal in the tank.