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How long has she had this scab?
Is she an indoor kitty?
Can you post a picture?
After your reply please give me a few minutes to type.
This scab like lesion is most likely a harmless benign papilloma. It is similar to a human wart, caused by a virus:
Sometimes they ulcerate and cause the cat discomfort. If that happens or they are in the mouth impeding eating we remove them.Many times they spontaneously disappear on their own.
Apply some raw honey. It is a marvelous healing agent:
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