Justin Bieber revealed a mystery leg injury during his recent trip to the spa.

Photos obtained by Page Six show the “Sorry” hitmaker entering Voda Spa in West Hollywood, Calif., on Friday while wearing a black bandage knee brace on his left leg.

Bieber wore a vibrant red hoodie, a pair of green checkerboard shorts and some blue slides for the casual solo outing. He finished off the look with a blue baseball cap.

The details of the injury remain unclear as the singer has not yet publicly commented on it.

A rep for Bieber did not immediately respond to Page Six’s request for comment.

Friday’s outing comes after Bieber started showing problematic behavior online with his casual drug use and unanticipated rants .

The “One Less Lonely Girl” singer most recently garnered attention afte

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