I have a small (1/3in wide) hard lump on the left side of the crown of my head. I was told it was probably a calcium build up by my doctor but she never examined it. I still have the lump six months later and it feels like it is getting bigger (I can't see it in the mirror where it's located), I am also getting more frequent headaches. It is under the scalp, I can move the skin a little, no hair loss and the lump itself does not move as if it's attached to the skull. It hurts to touch firmly but not lightly.