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What could the blisters on the roof of my mouth be caused from?

Posted by cherrylinda

My dentist or doctor didn't have an answer for me.  Could it be from a vitamin deficiency, stress or a combination of many things?  Almost every month right before my period, I get a small cluster of blisters on the roof of my mouth that eventually pop and are very painful until they heal after a few days. What are they caused from and why? It doesn't happen every month so I'm wondering what is triggering them.
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