My robo has a lump :(

[emmypaige]

Hello,

Yesterday I noticed that my robo has a lump on his right hand side on the size of his belly near the top of his leg, it’s the same colour as his skin and is kind of soft but doesn’t feel pussy or anything and it has fur growing over it, he doesn’t flinch or anything when I touch it and he’s still his normal self eating and drinking and running around still being really active and he doesn’t seem in pain with it.

Does anyone have any ideas on what this could be as I’m really worried, I will take him to the vet but just wanting to see what people’s opinions were, he’s around 18 months old.

Thank you!