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"Saltburn" actor Barry Keoghan's own medical battle sounds like the premise of a horror film.

The Irishman, who has been active in Hollywood for over a decade, recently shared that before starting production on a film, he was diagnosed with a disease that jeopardized his life. In an interview with GQ Magazine, the 31-year-old spoke about being diagnosed with a rare flesh-eating disease called necrotizing fasciitis

Keoghan says he not only feared the loss of his arm, but also his life. The possibility of amputation was discussed, and doctors were not sure if he would live.

INSPIRATIONAL STARS MICHAEL J. FOX, JEFF BRIDGES, OTHERS REMAIN HOPEFUL AMID MAJOR HEALTH CRISES

Barry Keoghan in a black sweater with buttons up the shoulders smolders on the carpet

Before beginning production on his film "The Banshees of Inisherin," Barry Keoghan says he discovered he was suffering from a flesh-eating disease. (Gilbert Flores/Variety via Getty Images)

According to the Centers for Disease Control and Prevention, necrotizing fasciitis is "a rare bacterial infection that spreads quickly in the body and can cause death." They report 1 in 5 people diagnosed will die from the infection, even with treatment. 

Keoghan survived and has scar tissue on his arm to prove it. He was supposed to start filming for his 2022 movie, "The Banshees of Inisherin," when he discovered the infection. Martin McDonagh, who partially wrote Keoghan's role, remembers questioning if the actor would make it.

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Barry Keoghan in a green sleeveless vest on the carpet in two pictures

Barry Keoghan's arm has scar tissue from the infection. (Getty Images)

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"I’m not sure if he was on a lot of meds, but he seemed to shrug it off," McDonagh told GQ. "We were only about four days out from shooting, and his arm was puffed up. But he was like, ‘Yeah, no, I’m going to be fine — I’ll see you on Tuesday.’ I went to the hospital thinking, ‘S--- — is he going to die? Let alone, is he going to make the movie.' But I came out of there energized and looking forward to it."

Keoghan says he has memories of his heart monitor beeping and McDonagh offering words of encouragement about potentially being nominated for an Oscar. He did score a nomination for Best Supporting Actor at the Academy Awards, but did not reign victorious.

Barry Keoghan looks stoic on the carpet in a white button down and black jacket

In 2023, Barry Keoghan was nominated for Best Supporting Actor for his role in "The Banshees of Inisherin." (Christopher Polk/WWD via Getty Images)

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Keoghan does not seem to have let the near-death experience stall him. He has four projects in production, including a mini-series with Austin Butler. "Saltburn," with Jacob Elordi, is out now.