Hi, I'm hoping someone will be able to help me. I discovered lots of lumps and bumps on the underneath of my male guinea pig Popcorn. There all different sizes and doesn't seem to bother him at all. I took him to the vets and they've never seen anything like it, since then the vet has called saying he's consulted other vets and they've never come across it either. So was hoping someone might of had something similar? It's been a month now and they've not changed and he seems normal in himself.