My 7 year old neutered male cat got in a fight with my other cats a few days ago. I put hydrogen peroxide and ointment on the wound when it was fresh, however, it has since scabbed over and swelled. The swollen wound is on his face between his ear and his eye and the hair on it/around it has fallen off. I need advice on how to treat it at home since I can't afford to take him to the vet. Thank you for your input.