I woke up this morning and the bottom of the right hand side of my head was aching, just above the hairline before the neck. I put my hand to it and there's a lump there which is painful to touch, it also hurts when i move my head. I tried to see if maybe it was a large spot or boil but could see in the mirror as it's underneath hair. It may even be an ingrown hair? I've never heard of tumors or sists being painful?