Macaulay Culkin is scarred from his time on “Home Alone.”

The actor opened up about the incident that left him with a permanent mark during the “A Nostalgic Night with Macaulay Culkin” event on Saturday, which celebrated 35 years since the Christmas classic hit theaters.

Culkin said that his co-star Joe Pesci “bit me during rehearsal” before filming even started.

“The thing you have to remember also, I’m not really on screen with Joe and Dan [Stern] a lot of the movie. They’re off doing everything,” Culkin said, via People magazine. “I was just talking to the ether.”

“So I didn’t really know [Pesci] all that well. And so this is one of the last days of filming, and I’m hung up there, so vulnerable — 9, not just a regular 9-year-old,” Culkin said, recalling a memorable scene from the movie where he comes face-to-face with the intruders, and Pesci threatens to bite off his fingers.