There is an old cat (older than 15 yrs) and he is very skinny but active. Recently he got a very very large growth on both his outter upper leg. It is very hard mass and he is limping from it. It is not my cat and the people whom the cat belongs to don't have the money to take it to the vet right now. The ball is about a softball. I was wondering if anyone had any idea of what it could be or what they could do for him.