Barry Keoghan looked like 'Satan sitting in the sauna' at gym after getting sunburned wearing fake face tattoo

"When you start praying in the sauna, it gets weird then," the "Saltburn" star said.

Barry Keoghan commits to his roles, even if they make him look monstrous.

The Irish actor recently recalled the "hardest thing" about sporting fake tattoos all over his body for Andrea Arnold's Bird on the Happy Sad Confused podcast: "staying out of the sun. Because it was in the summer, the sun [was] catching the tattoos and then leaving sun marks around you. So even when you took the scorpion off, you'd have a scorpion on your face, or the cross."

Keoghan said he'd "be at the gym and it'd be like a cross, and they'd be like, This f---ing dude... you know what I mean? This Satan sitting in the sauna going, 'Hey lads, fake tattoo. Sorry.' And like, there's no tattoo, it's just a white mark with a cross. You know, evil spirit."

In Bird, Keoghan plays Bug, the flashy, free-spirited father of the curious and cautious 12-year-old protagonist, Bailey (Nykiya Adams). Bug zooms around on his electric scooter, imports frogs that secrete a hallucinogenic ooze from Colorado, and mouths off at anyone who gets in his way.

It's a role that required him to be outside a lot, and Bug isn't the type to care whether he's fully clothed or not. Meaning those tattoos — including a spider, centipede, and moth in addition to the scorpion and cross — stood out at the end of each day in even greater relief against his ever-reddening skin.

“When you start like praying in the sauna," Keoghan joked, "it gets weird then."

Related: Barry Keoghan says he doesn't have a 'normal father-son relationship' with his child because of his own upbringing

Like his Bird character, Keoghan has made it clear that modesty isn't among his chief concerns as an actor. His now-infamous nude exhibitionist romp in the final scene of Emerald Fennell's Saltburn shocked moviegoers. He later caused more blushing when he confirmed he used no prosthetic to film the scene.

Keoghan told Entertainment Weekly that he didn't question Fennell when she asked him to bare all for the closer. "It totally felt right... It's ownership. This is my place. It's full confidence in, 'I can do what I want in this manor. I can strip to my barest and waltz around because this is mine,'" he said, adding, "It was fun."

Related: Barry Keoghan reacts to Sabrina Carpenter's 'Bed Chem' performance at recent show

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Bird premiered in the Competition at the Cannes Film Festival, picking up the Prix de la Citoyenneté for its director, a parallel prize given to the film that most embodies humanist values.

The film is currently in theaters, and Keoghan can next be seen in the upcoming Peaky Blinders movie.