Daniel Ponce de Leon plunked Suarez on the left hand with his first pitch of the at-bat in the fifth inning. Suarez spent only a few moments with the Reds' trainers on the field before going back into the dugout, throwing his helmet to the ground in apparent frustration.
The Reds said Suarez will be examined in Cincinnati on Monday morning after the swelling in his hand goes down.
Suarez hit his 40th home run in the first game of the doubleheader in a 4-3 loss. He was 0-2 in the nightcap before leaving the game.
The Associated Press contributed to this report.