sore abscess cyst tumor

So my uncle has had a female guinea pig for about 5 years. She was living with her babies, but they were given away, as well as the male since he was not neutured and hard to contain. He has rescued several cats, moved, and has other personal things which don’t give him enough time for a Guinea...

we just adopted 2 awesome pigs from friends of ours. One had a very swollen hind quarter and yesterday it seems to have burst open. It is quite vile looking but seems way too big to be an abscess or a cyst. Not sure what this is or what to do.