Baby Boy Sweets. What is a "Rodent Ulcer" : Feline indolent ulcers, also referred to as rodent ulcers or eosinophilic ulcers, are a cutaneous reaction pattern in cats that affect the muco-cutaneous junction of the oral cavity. Most indolent ulcers occur on the upper lip near the philtrum or adjacent to the upper canine teeth. *Much like our Stardust, Sweets has a severe rodent ulcer | Quality of Life Rehab & Foster, Inc.