United Kingdom, Sept. 7 -- Kate McKinnon's tongue is "shedding".

The Roses actress has developed an inflammatory condition called "geographic tongue", which is harmless but looks "gross" and has been sharing pictures of the inside of her mouth with a friend who has the same issue.

Discussing the last picture she took on her phone, she told People magazine: "I took a photo of my tongue and sent it to an actor friend of mine.

"We both have the same medical condition. It's called geographic tongue. Your tongue sheds in patches and looks like an atlas, hence the name 'geographic tongue.'

"It's gross. We brag about how geographic we are on any given day. Maybe I shouldn't be saying this in a magazine."

The 41-year-old star loves developin...