Lump on new baby Peter

So Peter is my new 3 month old boy. And today I discovered a little lump on his belly. It doesn't seem to bother him at all. But I hadn't noticed it before. Granted I've only had him for like a week now and I don't rub his belly too much... But I'm wondering if it's just from the skirmishes he got in with his new cage mates or if it's something I should be more concerned about...
No blood was drawn during these fights and the lump only protrudes a bit from the surface but is still covered by fur...
It's about the size of a small Lima bean... Only slightly bigger than a pea...

Can u take a pic of his belly and draw where the lump is so we can rule out umbilical hernia or preputial gland abscess.

He made this photo thing extremely difficult. And after many scardy poops. Lots of squeaking. And a couple slaps in the face with his tail I got 2 photos.

A frontal


And a side shot as he attempted to twist away....

That looks like the location of an umbilical Hermia.

Should I just keep an eye on it then? Those can sometimes fix themselves right?

I agree with hernia - Tucker had one. Sooner you have it surgically repaired the better.

Ugh Peter why you be so difficult... Thanks guys!
Time to start saving up I guess...

Take him to the vet first and get it confirmed.