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his normal lip
Quoted from: http://www.peteducation.com/article.cfm?c=1+2141&aid=3619An indolent (painless and slow to change) ulcer, or rodent ulcer, is usually found on the margin of the cat's upper lip. The indolent ulcer has a very unique appearance and typically does not require further diagnostics. At times, a lesion will also form on the cat's tongue; usually near the back of the mouth. The exact cause of an indolent ulcer is not known although a genetic predisposition and a hypersensitivity reaction, such as flea-bite dermatitis, are highly suspected. This is the most common lesion of the eosinophilic diseases.