A long-time fan of Lollapalooza says he was attacked last weekend and seriously hurt during a show.
29-year-old Ben Lenet of Wicker Park was at an Arctic Monkeys show Friday night with some friends when he was tackled by a man who sank his teeth into his arm.
Lenet's friends hit the man numerous times, trying to make him let go.
The alleged biter eventually released his grip, got up and disappeared into the crowd.
Lenet was treated at St. Joseph Hospital and released.
He was given blood tests at the hospital, but he says he'll need follow-up tests for Hepatitis and H-I-V.
Lenet posted his story to the online forum Reddit. Chicago Police have confirmed his story.