Hello, i am 22, 5'2" and 116 pounds. For a couple of years or more I've had a lump at the base of my tongue, underr the skin. It's smaller than the size of a pea, round and moveable. Habe asked doctors and dentists about it but have never got an answer. It hasnt changed at all ever and it's not painful. No history of cancer in my family and in full health, good oral hygene too, and not a smoker. What could it be? Thanks