I have a hard knot on the left side of my head.  it is small marble and it hurts.  not located on the right side.  been having warm sensation on the top on my head, I was thinking it was stress.  But now this knot is prevlent and sore I am wondering.
Hi, thanks for writing to Chat Doctor. Well, if I were your family physician and had you presented this painful hard knot on the head, I would clarify some important facts about such nodules as follows