Miller will not travel with the Heat to Toronto and will not play against the Raptors Wednesday night.
He left the arena in a wheelchair nursing a knot above his eye after taking an elbow from Jeff Foster in the third quarter of the Heat's 110-103 victory over the Indiana Pacers. A Heat staff member went to the hospital with him. The team called the injury a "contusion" over his right eye.
Miller suffered a concussion last Friday night in Detroit and underwent some tests before being allowed to fly with the team to Boston that night. Then Sunday Miller took another hit on a pick by Kevin Garnett that left him woozy into Monday's team workout.
"It is the way I play, I'm going to have [concussions] from time to time, you play through them," Miller said on Monday. "If I forget my name I'll be worried, right now I'm fine."
Miller had bouts with concussions earlier in his career when he played for the Memphis Grizzlies, missing six games during the 2004-05 season and two games in the 2005-06 season with head injuries.
Brian Windhorst covers the Miami Heat for ESPN.com.