EE was helping unload material from a semi-trailer. EE went to pick up some dunnage used as spacers for the materials and it was nailed together so ee pulled up hard and the nails gave way easily and the 2X4 hit ee in the lip. EE cut lip, so ee went to the doctor and received 3 stitches. There was no lost time or restrictions put on ee. EE healed nicely.