The suspect is described as a white man around 40 years old, 5 feet, 10 inches tall, with an average build. He is balding with short brown hair and a pot-belly.
The man went into the girl's locker room at South San Francisco High School two weeks ago. Police say he made eye contact with a group of five cheerleaders and then left without saying a word.
Anyone with information about the incident is asked to call South San Francisco police at (650) 877-8900 or the anonymous tip line at (650) 952-2244.