Having acne (粉刺) problems can be hard. It can make people feel less confident (自信的) about themselves. This happens to over half of US teenagers with acne, according to a recent survey. These teenagers say that they don’t feel good about posing (摆姿势) for pictures with groups of people. They don’t like to take part in social gatherings, either. Some don’t even want to go to school. TEENS