My 15 year old son just noticed he has a pea sized, very hard, lump at the base of his skull , very top of his neck . Whether he bows his head or looks upward, it s still very present. I cannot move it around. I thought maybe a bone spur? It doesn t hurt he says. He just feels alittle dizzy sometimes. I am going to have this checked out, but I am concerned because my Aunt passed away from a similar symptomed tumor . I know you can t give answers, I am just a concerned mother, also Nurse. I have never seen a lump this hard that you cannot move. My Aunt had a tumor form in the same area but was a little softer and you could move it slightly. This just feels like a bone spur