Weird disappearing lump on guinea-pig...

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One of our male GPs ( smooth coated) had a small, firm lump on his belly, halfway between his front leg and back leg.
I found it at New Year and have kept an eye on it. I know GPs are prone to lumps (fatty) and tumours (benign or malignant). My old GPs (2 Himalayan sows) had largish lumps in the baggy bit of their necks when they got old. Very slow growing, and didn't worry them. They lived to 5 & 7.
GP boar's lump was the size of a Smartie.
Definately not an abcess. Firm and imobile. His skin moved over it IYSWIM, so attatched deeper than skin level.

But it's gone

DD and I held him up and felt all over (I was thinking maybe it has moved) but I can't find where to?

I've ruled out abcess or bite because it was there too long, didn't change, was dry, and no break in skin.

Hernia?
Too high for an undescended testicle (I hope).

I'll keep checking him and if I find it again I'll take him to the vet.

Or maybe I've got magic healing hands it's just a mystery.

It could, perhaps, have been a cyst? They can come and go - on people at any rate, so the same may be true of GPs?

Thanks occasionalposter.
I was wondering about cyst. My mum had one on her neck, it dissappeared (just went, not burst or anything).This was firm, symmetrical and he didn't complain when I prodded him (above complaining about being prodded )

I did wonder if it was where his bellybutton would be but its the wrong place. His all-in-one guinea-suit has stretched a bit since he was born, but not this much!
Babies can get navel hernias can't they.

My 9 yo DD (it's her GP) has taken to obsessively checking the boars tummies now. They take it in very good humour TBH. (ie they haven't bitten her. They'd probably give me a swift nip if I did that)

Today she squeals from the shed "Mum there's something strange on GP2)

It was his testicle. He's got 2 . As does GP1. (she double checked her GP).