What causes a hard painful lump on the skull?
Patient: I awoke with a hard lump on the left side of my skull.  Approximately 2 1/2 inches from my left ear, and right at the base of my skull.Very hard to the touch.  Pain when touched is very sharp, like an electrical shock.The mass doesn't move or drift--also causing some irritating neck sensations.I ABSOLUTELY do not attribute this to a spider bite, or muscle pull of any kind.Has been 2 days now with no signs of any improvement.  I'm not sick in any way, so an infected lymph node also seems doubtful, but I understand still a possibility.Wondering if a tumor can appear that fast?Any help or suggestions would be GREATLY appreciated.  I've done as much research and diagnosing as I could.  Next step obviously is med attention.  Thx 4 taking time to read this Doctor: Hello!Thank you for the query.From your description you have an inflammation in this area. An abscess has probably appeared and as long as it wont be incised, the symptoms will be present. This is not a cancer for sure. It does not grow that fast and rarely grows in mentioned area.Most likely you have had there a sebaceus cyst which has gotten infected.Please consult general surgeon. Incision should be done.Hope this will help.Regards.