lump on belly

Goodevening fellow Guinea lovers! I have a question. I have a very sweet 2 year old female guinea pig who has been forming a fatty lump on her belly button since september last year. I've gotten this checked out by the vet in the same month, and after poking a needle and taking a sample she...

I was about to trim her and Carrie's claws when I noticed that Patsy has a hard, pea sized lump on her stomach under the skin. It's not a smooth lump (it feels almost walnut like I guess), and if I press against the sides of it the lump does move side to side slightly. She's eating, drinking...

Just today when I picked up my piggy (Hurley), I noticed a smooth lumpy structure on his belly. It does not involve the nipple. The mammary area seems healthy and pink. He does not seem to be in any pain. Its on one side between the left nipple (below it) and the genital area. Should I be...