<human>: 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.
<bot>: 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: 1. There are few possibilities in this case and all of them are benign or inflammatory therefore not to worry but must be investigated properly!possibilities are: small boil, hair-follicle infection, resolving abscess, neurofibroma, pilomatricoma, varieties of infections and small abscess; myogenic granuloma or hemangioma-like pathology; etc.2. The disease needs to be confirmed and before any empirical therapy!therefore you need to get to your doctor for a simple examination and relevant tests if necessary! ... Hope this answers your question. If you have additional questions or follow-up questions then please do not hesitate in writing to us. I will be happy to answer your questions. Wishing you good health.