At times, the inside of my mouth and nose become incredibly itchy. I end up chewing the inside of my mouth until it bleeds, and similarly I scratch my nose to the point where it becomes very painful. The itching is not constant, it comes and goes, usually lasting a few days. Sometimes I get it once or twice a week, other times it's months in between occurences. What is this, should I be worried? How can I prevent it?
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