This would’ve been one cold burn.

Antonio Brown has been hampered during his first training camp with the Raiders because of what appears to be blistered feet. According to NFL analyst Chris Simms, Brown burned his feet in a cryotherapy machine and they became frostbitten from not using the correct footwear, per ProFootballTalk.

The 31-year-old receiver, who was traded from the Steelers during the offseason, began camp on the non-football injury list. Even after being activated from the list, Brown has essentially been a non-participant.

Raiders coach Jon Gruden told reporters Tuesday that Brown is away from the team “gathering information” on his feet, and Gruden wouldn’t discuss the matter further. Brown had visited a foot specialist on Saturday, according to ESPN.

Brown recently posted to his Instagram story a picture of his feet, which appear to have peeling skin.