Hi I am very concerned about my cat. He is a 15 yr old inside cat who has developed a hard lump on his side. I had taken him to the vet and they wanted to do a biopy. I heard if it was cancer it could cause it to spread . A week ago it started to come out of his side to an open wound. He is eating and drinking but I would like to make him comfortable. I feel vets take advantage of these situations. Please help!