Every once in a while I get a couple very small (smaller than a pin head) painless white bumps under my tongue, that hang around for a while, and then just disappear for no reason. What are these? They don't hurt, they are very small, white, and nothing really seems to bring them on but they last for a bit and then go away. They are on the BOTTOM like underside of my tongue, and it's not an std because I was just tested, and so was my BF. I got them before I was sexually active anyways. It almost is like a zit on my tongue or something? Calcium deposit? It's not a cold sore, I know what a cold sore is, it's not a canker sore either. They are painless. Very small. Kinda hard like a pimple, and I can pop them. I have like 3 little ones. I KNOW IT"S NOT A CANKER SORE OR A COLD SORE, AND IT'S NOT AN STD.