Guppy with Lump and Pink Streaks

[Newbie126]

Hello,

I have a male guppy with a lump on its side right behind his right gill, and along his back he has pink streaks none of the rest of my guppies have.

I'm a guppy newbie and can't figure out what's wrong with him or if I should separate him from the others. Any suggestions?

Thanks.

 

[CopperCake]

Did you just buy him like this or did this develop?

 

[Newbie126]

Did you just buy him like this or did this develop?

He developed it.

I'm not sure how long the lump has been there, maybe a week? It used to be smaller, it's now about half the size of a pea. He seems to be swimming and eating normally though!