Biting arms

My daughter has recently started biting her arms over the past few weeks. She has many bruises on her arms which some are swollen. They range from big to small little ones and look very painful. She had to be held because of this yesterday in school. They explained that she was biting with extreme force so they held her to stop her. She's never done this before and I'm lost on what to do. Like, how do I prevent the worst injuries as much as I can without touching her because that makes it worse? 

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