Howard was 0 of 4 from the floor and had two points before he flexed his right shoulder and headed to the locker room with 2:21 left in the second quarter.
He did not return for the start of the second half. Lakers officials say Howard aggravated the shoulder that has a torn labrum and already had him listed as probable for the game.
Howard had two rebounds and a blocked shot in just over 14 minutes.
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