EE HAD AN ALLERGIC REACTION TO AN UNKNOWN SUBJECT (BUG BITE) (CHEMICAL). EE WAS PERFORMING NORMAL DUTIES(BOLTING), LOADING BOXES OF GULE CARTRIDGES ON BOLTER WHEN REACT OCCURRED. CARTRIDGES WERE NOT DAMAGE. EE WAS TAKEN TO NEAREST MEDICALFACILITY WHERE MEDICAL PERSONNEL COULD NOT DETERMINE THE CAUSE OF THE REACTION. EE ONLY TEMPORARY REACTIONS & RET'D TO WORK ON HIS NEXT SCHEDULE