<s>[INST] Hi. Im am 16 years of age and yesterday I Noticed a Somewhat medium sized( about the size or a quarter or Slightly bigger) bump on my head Close to my ear. It Is Hard and the area around it is Painful.Im Not Not sure What it is. Can someone help? Could it be A tumor? [/INST] Hi, Thanks for writing in. A bump on your head for a while, that is hard and firm might be a cyst arising from your scalp. It may or may not be arising from the skull. If it has been present for a long time and is slowly growing, then it must be a benign lesion. In benign firm lesion, they can be Osceola, epidermis cyst or Desmond cyst. I would suggest you to consult a neurosurgeon and get a CT scan done if necessary. Most likely it is not a brain tumor and CT scan will tell if it needs to be removed. Hope this helps. </s>