Employee hit right shin on metal frame. Resulting injury was about size of a pea. Applied antibiotic and a bandage.On 1/24/10 while showering at home the scab fell off.The next morning area was very red and painful to touch. On 1/25/10, he reported to work but pain became too much. Went to ER, serious infection (cellulitis) had set in. Anitbiotics prescribed.