Q. My cat came home injured, he has a bald spot on his shoulder and there is a wound, it's swollen and when pressure is applied, lots of pus comes out.
JESSICA L DESROSIERS
A. It sounds as if your cat has an abscess, an infection that is very common in cat fights where the skin is broken. These are treated by seeing a veterinarian to have the wound drained and a course of antibiotics given. In some cases a temporary drain is also placed to keep the wound open and draining until all the infection is cleared out.