I've done this before. I didn't get it checked out but it did heal over time. You should treat the frost bite like a burn. If it gets worse then get it checked out. Mine wasn't numb for long - so maybe its a good idea to see a doctor. You could perhaps tell the chemistry teacher, who might have an idea what to do as they have risk assessments for the materials used, but they will probably tell you to see a doctor.
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