Sam Kanizay, 16, had been playing football with his friends on a beach in Brighton, Melbourne, when he decided to cool off in the water.
He came out minutes later with blood all over his legs and nobody was quite sure what had happened.
He said that he felt tingling in his legs but thought that may have been as a result of playing football.
But he added: ‘My first instinct was that I must have stepped on a rock. But I realised that couldn’t have been it, because it was evenly distributed over my whole ankle and foot.’
It is believed that these tiny lice were responsible for the injuries to his legs