In one sentence, describe what the following article is about:

Steroid injections are the most common way to treat rodent ulcers in cats. Your veterinarian will give the cat an injection in order to treat the ulcer. Depending on the chosen steroid, these injections will be given once every two to three weeks, until the sores have disappeared. Rodent ulcers can also be treated by giving your cat prednisone orally. Your veterinarian will prescribe pills that are given orally every 24 hours until the lesions are gone. In order to properly administer the medication, follow the directions provided by your veterinarian. In some instances the ulcers may become infected. If this happens, your vet will likely prescribe an antibiotic in order to treat the infection alongside the lesions. Take the antibiotics as directed by the veterinarian. Some vets believe that essential fatty acids can help relieve stress in cats and reduce allergic reactions in some instances. If you are not feeding your cat a premium food, they may not get enough fatty acid in their diet. Change to a new food that is higher in essential fatty acids or give your cat a supplement, as directed by their vet. Rodent ulcers are typically caused by an allergic reaction. As a result, they may recur if you are unable to determine what is causing the allergy. If the ulcers return, take your cat to the vet and repeat the treatment.

Summary:
Treat the ulcers with steroid injections. Give your cat steroid pills. Administer antibiotics. Try a food that contains essential fatty acids. Repeat treatments as necessary.