I have a bubble under my tongue that is uncomfortable. When it first occurred about two weeks ago, it was a large blister that was a mix of blood and a watery substance. I popped it, but the next day it came back and every time is has popped after that it has come back. I don t know what it is, and I want to get rid of it. I have not kissed anyone in the last six months, I haven t had oral sex, I am not aware of any food allergies that I may have, I am a 24 year old female, I live in a humid climate (Hawaii), I have Raynaud s phenomenon and I have previously been diagnosed with Anemia.