Ouch! Don't take the Kylie Jenner challenge

It's a disturbing new trend. And hopefully it'll stop as soon as it started.

On Sunday night, #kyliejennerchallenge popped up on Twitter.

What's happening is that kids are trying to plump their lips up to look like Kylie Jenner's.

The Keeping Up With the Kardashians lil sis has said that her pouty look is natural.

And one "natural" way to get the look is to put your lips into a small glass and suck in as hard as you can. It causes the lips to briefly swell, just as they might with a cosmetic injection.

The problem is that it also can cause serious pain, bruising and scarring around the mouth, as you can see from photos and videos popping up online.

And in case you know someone trying it, cosmetic surgeons are advising against it, of course. Dendy Engelman, a board certified dermatologic surgeon told Seventeen.com that it can cause "permanent disfigurement."