If I lift my head it is more obvious I can rest my finger on it but also can push it toward the spine. It feels like cartilage a piece of cartilage the way it moves but it is the size of my finger tip. For approx. two months I have had severe headaches. My muscles on my back shoulders and neck are stiff. as the day goes on my neck starts to stiffen up and gets more achy. I do plan on going to the doctors but I'm just worried and wondering in the mean time does anyone know what this could be?