"It's on fire right now," Wall said about his shoulder. "It was like my arm went dead."
Wall underwent X-rays, which were negative, and left the arena with his arm in a sling.
He finished with 13 points, shooting 4-for-13 from the field and 5-for-12 on free throws, and handed out 15 assists.
The Wizards play the Raptors in Toronto on Sunday before returning to Washington for a four-game homestand.
The Associated Press contributed to this report.