EE WAS WELDING A GUSSETT ON THE DOOR TO THE WHOLE TIRE CHUTE. HE WAS WORKING OFF A TEMPORARY PLATFORM,WELDING OVERHEAD & A PIECE OF HOT SLAG DROPPED INTO HIS LEFT BOOT. THE BOOT WAS NOT LACED UP ALL THE WAY ALLOWING AN OPENING FOR MATERIAL TO DROP INTO. HE ALSO DID NOT REPORT THIS TIL 5 DAYS LATER. DIAGNOSED W/CELLULITIS LEFT LEG. BURN WAS @ ANKLE BONE.