Fin bump? Tumor? Google isn't helping!

Hi community! So I've been digging through Google to figure out if Confetti has a tumor on his fin, but I'm struggling to find anything relevant or similar to the bump he's got, so reaching out here is my next best shot and see if anyone has a suggestion?

He doesn't appear bothered by it at all, it's not stopping him from flaring at me whenever I pass by without feeding him, and he's as energetic as always

Also my baby boi is a bit bloated because he eats more air than food.