Scarlett, I can sympathise with you. I suffer from this at least once a week - I get them inside my cheeks, under my tongue, on my tongue, roof of my mouth. The only thing I find helps is to burst them very carefully (otherwise they get infected and turn into ulcers) and rinse your mouth out with slightly diluted cider vinegar. I have mentioned this to my dentist and she didn't seem concerned. I think I'm just prone to this, it's been happening for so long now. The bit I hate is when you can feel it getting bigger and bigger.....yeucchh!!!!