My inquiry is to find out what has caused a non-painful blemish on the left-side, near the back of the tongue? It appears from looking at it, that it's a pimple looking bump without a head - about 3/16" in diameter, and has been there for a week. Is it because I've been fighting a cold coming on, is it stress related or is it because I'm taking too many vitamins and my system is exposing an internal escape through this blemish?