So when I picked up my guinea pig, Sabrina, I noticed that she had a weird lump (sort of between her nipples) when I pushed on it, it moved. It was about the size of a penny and very firm. My first instinct was to squeeze it a little to see if it hurt (it didn’t) or was something that would just pop and go away. I felt the lump pop but when I looked nothing had come out. I can still sort of feel something under the skin but it’s much smaller. Have I hurt my guinea pig by doing this? I’m very concerned.