EMPLOYEE STATED THAT HE HIT HIS HEAD ON A PIPE WHICH CAUSED HIS HARD HAT TO STRIKE THE BACK OF HIS NECK WHICH CAUSED A KNOT ON HIS NECK. HE SAID HE REPORTED IT TO THE PLANT LEADMAN BUT NOTHING WAS DONE BECAUSE THERE WAS NO UNUSUAL PAIN OR ANY COMPLICATIONS AT THE TIME. ON 3/11/05 EE REPORTED THE INCIDENT AGAIN AS HIS DR. SAID HE COULD NEED SURGERY, SURGERY REQUIRED 11/07/05.