Teens everywhere are smooshing their heads together in an attempt to capture the perfect selfie, and while that sounds pretty innocent, danger is lurking just around the corner: all those selfies could be causing an uptick in head lice cases.

SFist talked to a lice expert located in Scotts Valley named Marcy McQuillan who notes that though lice is usually found in elementary aged kids, she’s seen a “huge increase” in lice cases in teens this year. The obvious culprit for this anomaly? Evil, evil selfies.