Well, most of us are so happy and pleasure to share something wonderful with closed friends. It’s a good thing, but not all people can get a nice result because some accidents. To be infected by sharing mascara is one of them. Eyes are so weak that cosmetics are easy to do harmful to them. Sometimes you get pink eye or red eye just because your kindness. Cosmetics are very special medical things. The effects are difference among people. Some may feel good for them, while others allergic to them. And if your friends are suffering eye problems, for instance, pink eyes, dry eyes, black eyes and red eyes, be careful for your own eye health. Under this condition, the rate of getting infection will be increased. But not all times to share mascara is dangerous. So the best thing to do is ensure that your friends whether have eye diseases or not. However, in my view, no any eye shadow, eyeliner and mascara sharing with friends in a long time. May be it sounds selfish, but it's good to protect eyes.