Byrd hit the ball that bounced off the ground hit him in the right cheek, causing a bruise and facial laceration.
"Basically in layman's terms, he has a small cut under his eye and a facial bruise," Cubs interim manager Mike Quade said. "Being as cautious as they can be with him, they sent him to Northwestern [Hospital] to make sure everything in that area is OK."
Byrd had an X-ray and results were not announced.
Bruce Levine covers baseball for ESPNChicago.com.