In the centre of the top of my head, it feels like my scalp is almost coming loose, like there is pressure there when i move my head

More info needed: It is normal to feel a little movement of your scalp against your skull, just like your skin on the back of your hand moves around some when pushed with your finger. Is the contour of the top of the head normal? is there any kind of bump under the skin? Have you had any injury to your head. Do you have any headaches or vision problems ?