So a few years ago I underwent surgery on my right parietal lobe in order to remove a cavernous angioma that had been causing seizures. By all measures the operation has ostensibly been a success. However, since then I have experienced a sharp clicking when my scalp moves (such as when I am lying down, washing my hair, etc.). It is quite audible, although the intensity of the clicking does osculate, and has been verified by friends, so I am sure it is not mental. I can't determine whether the source is my scalp or skull but it has been four years since the surgery so I would hope the bone has fused.
My question is, could this clicking be caused by the bone flap shifting? And could this be an indication of a serious issue?