Re: Blister/Bump under tounge
Several yrs. ago I had a mucocele or ranula under my tongue. It was a plugged salivary gland. However, this occurred not on the underside of my tongue, per se, but rather on the jaw tissue beneath the tongue. Not sure if that's your situation or not.
Eventually I saw an ENT, who palpated & tried to reduce the blockage by gentle squeezing. When that didn't work, he recommended surgery (outpatient). However, while I was waiting for insurance to approve the procedure, one day the dang thing just resolved on its own. I was driving along in my town & suddenly became aware that I had a mouthful of YUCK. Had to stop & spit. (TMI!) Apparently when saliva sits around for a few months it gets pretty ugly.
Anyway, within the next 3 weeks, the ranula recurred several times, but much smaller each time before it would discharge. And it's been almost 7 yrs. now with no sign of it. I'm actually quite glad to have been spared the expensive surgery ($1000s) & the loss of my salivary gland.
I hope your situation works out as happily. Best wishes.