“Late Show” host Stephen Colbert believes he knows the origin of the mysterious bruise that keeps appearing on President Donald Trump’s hand.

The White House has said the bruise, which began appearing regularly earlier this year, is due to frequent handshakes and aspirin use.

Trump often tries to hide the mark with concealer:

President Donald Trump's hands, seen on August 25. The White House has said the bruising is caused by frequent handshakes and aspirin use.
President Donald Trump’s hands, seen on August 25. The White House has said the bruising is caused by frequent handshakes and aspirin use.

Bloomberg via Getty Images

But Colbert discovered a report that tells a different possible story of how it appeared.

According to Republican National Committee Chairman Joe Gruters, last year Trump ate McDonald’s as soon as he got on his plane after campaign events.

“He had hot fries waiting for him at McDonald’s,” Gruters said on the “Chambers, Changes & Conversations” podcast, saying they were delivered to him as soon as he got on the plane.

“Yes, you need your McDonald’s fresh and piping hot,” Colbert said. “And apparently he takes his Filet-O-Fish straight out of the fryer, which is why his hand looks like that.”

See more in his Wednesday night monologue:

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