SAN FRANCISCO (KRON) — Images are showing up all over social media showing teens taking part in a disturbing new trend to look like reality television personality Kylie Jenner, the youngest of the Kardashian clan.

But the craze is leaving many of these teenagers with cartoonish lips and facial bruising.

The #KylieJennerChallenge dares teens to place bottles or jars over their mouth and suck in air like a vacuum. The exercise will cause their lips to blow up. The painful practice is being documented all over social media as participants post photos and videos showing their results — some ridiculous, some horrifying.

One social media post shows a man missing a portion of his upper lip. He explains that the injury happened after the glass container he was sucking exploded.

Whether that actually happened isn’t clear, but at least one doctor has issued a warning about the potential dangers of participating in this challenge.

“The new trend in trying to DIY lip plumping is quite concerning,” Dr. Dendy Engelman, a board certified dermatologic surgeon, told Seventeen.com. “Not only can significant pain, swelling, and bruising result from these suction techniques, but there is potential risk for scarring and permanent disfigurement with repeated attempts.”

Jenner has yet to issue a comment on the trend. The 17-year-old socialite did recently deny artificially enhancing her lips amid speculation she had some work done.

“I haven’t had plastic surgery,” she told Grazia Daily.