Still skinning the head

My file crashed on me but luckily i saved the file at the right time so nothing terrible happened and I'm still skinning the head.

Skinning the head

I've skinned his right shoulder and wrist and now skinning his head, going fine but there is this grey part that will not go away, it's really bugging me cause it stays in place when i move his head so it looks like some weird worm or something coming out of is skull every time he moves so......working on that right now.....T_T