The “Kylie Jenner challenge,” a new trend in which teens attempt to get the lips of the 17-year-old sister of Kim Kardashian—then share the results with the hashtag #KylieJennerChallenge. How do they plump their lips? They grab a shot glass (or other hollowed our round object like a Gatorade bottle, etc), place it over their lips, and suck. The results range from gross to completely horrifying. The swelling is caused by inducing negative pressure from the suctioning. This causes “vessel engorgement,” meaning your blood vessels fill with blood, setting off an inflammatory cascade of chemicals (think histamine and leukotrienes.) These chemicals then flood your soft tissue, and you’re left with swollen tissue. If you suck hard enough, you’ll break the fragile blood vessels around that area which results in bruising. If you’re fair skinned, you’re even more sensitive. The longer you suck, the more long term damage is caused.