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I get fluid-filled ulcers on the tip of my tongue when I'm very stressed (with ordinary stress I get them on the inside of my bottom lip). I normally use Bonjella to numb them a bit, but I haven't found anything that makes them go away - sorry. You could try changing toothpaste - I find Colgate or any kind of total treatment toothpaste triggers them for some reason, and Polo mints, so perhaps it's the mint flavouring that does it to me.