What medicine for cat mouth-corner ulcers?

Cat mouth-corner ulcers can come from trauma or oral inflammation. If only the corner is ulcerated with no other signs, wipe it gently with a cotton ball dipped in light salt water to reduce inflammation.

Then apply a pet oral spray or watermelon-frost to aid healing. Avoid irritating or hard food that aggravates the ulcer. If it’s severe or doesn’t improve, take the cat to a vet.