The aspiring model was jumping on trampoline with half-sister Khloe Kardashian when she got injured, reported Ace Showbiz.
"In the hospital thanks to Khloe Kardashian. Look at her page for the reason why," Kylie wrote in an Instagram post.
"My mom said 'never thought I would take you to the doctor for a trampoline accident at this age. This means war Khloe. PS. It was painful taking this photo," she added.
In the black-and-white snap, Kylie can be seen covering one eye with her hand.