So I don't know that I've ever really inspected my tongue all that much before, but I have a bump on it that hurts (like I bit it) and I was checking that out and noticed that way in the back, my tongue is covered in bumps! They aren't painful and I don't think I would've noticed them if I wasn't sticking my tongue out as far as it would go and even then they are hard to see! Are these bumps normal???