If the sores at the corners of the mouth are caused by a bacterial infection, the veterinarian may prescribe antibiotics. These medications can help eliminate the infection and promote wound healing. If the sores are caused by a fungal infection, the veterinarian may recommend antifungal medications. These medications can kill the fungus, relieve symptoms, and promote healing.

Once your cat's mouth sores are treated, you'll need to take steps to prevent them from recurring. Regular dental checkups, maintaining good oral hygiene, providing a balanced diet, and avoiding excessive stress are all important. Additionally, taking preventative measures can reduce the risk of recurring mouth sores.