Our bull has what looks like an abscess on his tummy, just inside his flank. About the size of a tennis ball. We got him in the chute yesterday, but it was late so we decided to wait and doctor him in a couple days when it cools down and in the daylight. My question is do abscesses rupture by themselves, or will we have to lance it for sure? I think if we can get him in the chute and calm, we should be able to take care of it, but he is a big boy and I hate to make him mad. But I want to give him a shot of penicillin anyway. What do you think?