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|Feline rodent ulcer - photo copyright Cuyahoga Falls Veterinary Clinic|
This ulcer would appear to be in the classic position, on the upper lip just off-center position. Sometimes they occur on the lower lip or the back of the jaw or tongue.
Feline rodent ulcers may be caused in part by dental infection, diet, insects, parasites (flea?) or environmental substances. A compromised immune system may be a cause as cats tested positive for the feline leukemia virus have been found to have rodent ulcers.
You'll need a vet to treat a feline rodent ulcer. Apparently, cortisone and antibiotics are the treatment of choice. There are other treatments.
Note: 1. Cat Owner's Home Veterinary Handbook page 233, third edition.
Associated: Most common cat illnesses.