Former SNL cast member and star of Greta Gerwig 's Barbie , Kate McKinnon , recently revealed that she had been diagnosed with a geographic tongue . The 41-year-old actress told PEOPLE : "I took a photo of my tongue and sent it to an actor friend of mine. We both have the same medical condition." Kate continued, revealing she thinks the condition is "gross." But, using her comedy chops, she joked that she and her actor friend "brag about how geographic we are on any given day."

What is geographic tongue?

© NBCU Photo Bank via Getty Images Kate was on SNL for 10 seasons

"Geographic tongue is an inflammatory process that makes parts of your tongue look smooth and red," Dr. Lauren Becker, DDS, PC told HELLO! . "This is because the smooth patches are missing papillae,

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