5. Sharing Makeup With Friends
Sharing your liners and lipsticks may seem harmless, but using your bestie’s tools and products, can easily spread harmful bacteria and infections to the face and eye areas.“When you apply makeup every day, these bacteria are transferred onto the brush, and ends up contaminating your makeup,” says Schlessinger. “While these bacteria may not harm you, they could be hazardous to your friend’s health.”

Among those hazardous conditions includes infections such as conjunctivitis and E.coli, which can thrive in makeup related formulas.

“Conjunctivitis, staph, strep and E. coli are just a few examples of bacteria that can thrive in makeup,” says Schlessinger. “It’s especially dangerous to share mascara, eyeshadow and eyeliner as these can lead to pink eye or other eye infections. Additionally, sharing lipstick, lip gloss or lip balm can lead to a cold sore.”