He injured his right hand while being honoured by Harvard University's Harvard Lampoon on Ocotber 24, reported People magazine.
41-year-old Fallon, who received the Elmer Award for Excellence in Humour, was treated at Massachusetts General Hospital before returning to continue the celebrations.
"Everything is totally fine. It was all part of the celebration in the street and some random girl knelt down in front of him abruptly as he was turning around and he tripped over her because he didn't see her," a source said.