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Oakland Raiders wide receiver Antonio Brown might have come up with a new reason to miss training camp — frostbite.

The issues that are keeping the star wideout from the practice field were thought to be blisters, with Brown posting a photo on social media on Monday showing skin peeling from his feet. But Chris Simms of PFT Live said he heard from someone with knowledge of the situation that the photo shows burned feet as a result of entering a cryotherapy machine without the proper footwear.

Hence, the frostbitten feet.

Raiders coach Jon Gruden told reporters that Brown wasn’t at the team’s camp in Napa, Calif., on Tuesday. He added that the team is “gathering information” but otherwise declined to comment on the situation, including whether or not Brown would be able to make his Raiders’ debut when the team opens the regular season on Monday night, Sept. 9, against the visiting Denver Broncos.

Brown’s agent, Drew Rosenhaus, did not respond to a request for comment from NBC Sports’ Pro Football Talk.

It all could make for a compelling storyline on HBO’s Hard Knocks series, which is tracking the Raiders during camp.

Brown reportedly visited a foot specialist on Saturday and was briefly on the non-football injury list when training camp opened.

“I think we’re all disappointed,” Gruden said about Brown’s absence Friday, according to The Athletic. “We want to get the party started.”

The Raiders acquired the seven-time Pro Bowl selection from the Pittsburgh Steelers in a trade in March and later signed him to a three-year, $50.125 million contract.

Brown, 31, caught at least 100 passes and exceeded 1,200 receiving yards in each of the past six seasons with the Steelers. He appeared in 130 games with Pittsburgh from 2010-18, catching 837 passes for 11,207 yards and 74 touchdowns.

–Field Level Media