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Hi. My name is***** Can you take a picture of the nipple that is affected and post it? How long has this nipple been like this?
Is she spayed? Is there any discharge from it?
Probably the best thing that you could do at home for this situation is to place an E-collar on her (the lamp shade collar) as it can provide a barrier to prevent further licking. Just stopping the licking for a period of a day or two can let areas of irritation quiet down.