Hi! anyone notice a bump on the upper part of the neck, it's in the dip part in the middle like along the spine and where it meets the skull. It is circular and attached to the spine (actually i dont know if this IS actually a vertebrae). It cant be seen but can be felt if you press hard especially if I look up and press hard. When I or my friends touch it it feels like it IS a bone because it's just that hard and firm moves as I tilt my head up and down. What could it be? If it is a vertebrae which one could it be?