I ate some really spicy food yesterday and now I have a blister in my mouth. I just got tested last month for herpes IgG HSV-1 and HSV-2 and they were both negative, so I don't think that's it. It's just one blister and it doesn't hurt or anything. Could that have happened from eating the spicy food?
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Does Eating Spicy Food Cause Blister In Mouth?
Spicy foods often irritate the mucosa of the upper palate. But if you have had it for more than a week go and visit a dentist.