EE WAS WELDING ON A PIECE OF HEAVY EQUIPMENT ON A HOT, HUMID DAY. OUTSIDE TEMPERATURE EXCEEDED 95 DEG. EE HAD SCARRING ON BOTH LEGS FROM AN ACCIDENT BACK IN EARLY 1980'S. THE BURN/SCARRING BEC AME AGGRAVATED FROM THE HIGH HEAT AND HUMIDITY. EE'S LEGS BEGAN BLEEDING AND SUSTAINED BLISTERS.