My horse has a giant abscess on her lip (three times the size of the other half of her lip) My parents wont take us to the vets, she is on antibiotics but will the giant lump ever go away?
Do you have a picture? It's probably nothing more than a "summer sore". What those are are worm larvae. Ivermectin dewormer is all you need. You can do a couple of things. Dose him normally than take another tube and rub it directly on the sore a few days in a row until it heals or double dose him. The antibiotics are a waste if that's what it is.