riddle

What attaches itself or grows on a fish that resembles a small light brown snail? Have a tetra that developed a small brown bump/growth some months ago on its snout, put him in isolation and said bump is now almost the size of a split pea. Fish has never skipped a beat and when it first...

Okay so this girl (guy?) was purchased a year ago from a LFS. I say its a girl bc i've seen her cheeks puffed out like she was holding but she's in large community tank so can't confirm it. Anyone able to help with an id?