hi i have a male guinea pig called Charlie he is about 3 and he has a lump on his back and i didn't take him to the vets as it wasn't effecting him or anything and i didnt want to put him through an operation when it may make it worse. anyway now where the lumo is it looks lik his skin is breaking but its still not effecting him i was just wondering if this will be life threatening to him and has anyone else had an issue like this with their guinea pigs i am going to take him to the vet now because I'm really worried and i want it sorted but i don't want him to be in pain so if anyone has any advice or has been through this it would be great for all of you to reply thank you it means so much x