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 after he shared a slew of summer snaps featuring his baby boy, Jack Blues, whom he shares with wife Hailey Bieber, via Instagram last month.

In the pictures, the pop star, 31, carried his son on his shoulders and sat on a couch while playing with the 9-month-old’s feet.

Among the photos was also a separate picture of him smoking a blunt with a friend on the same couch.

Internet-sleuthing fans quickly noted that the Grammy winner was shirtless and wearing only blue shorts in both pictures, prompting concern for Justin’s baby boy as many called out Justin for outright “smok[ing] in front of [his] kid” and “doing drugs with the baby around.”

While Justin’s rep slammed the “harmful” rumors of drug use in February, the “Peaches” songster has continued to show off his rampant marijuana use in the time since.

Earlier in May, he also admitted to ripping off Hailey with a phone case used to hold blunts modeled after her patented Rhode lip gloss-carrying cases.

In April, several people close to the singer expressed their worry for his mental health, telling the Hollywood Reporter that they feared he was falling apart mentally amid rumors of his financial troubles.

“Seeing him disintegrate like this … it’s watching the embodiment of someone not living their purpose,” a former team member told the outlet.

“He’s lost,” the former colleague continued. “There’s no one protecting him because there’s no one there willing to say no to him. You say no, you get blown out.”

At the time, the singer’s rep denied the source’s claims, telling Page Six that the insiders were “clearly ill-informed” and were “disappointed that they no longer work with Justin.”

“As Justin forges his own way forward, these unnecessary stories and inaccurate assumptions will continue. But, they won’t deter him from staying committed to following the right path,” the rep finished