Last month in Nagano, despite sweltering temperatures, a number of high school students were spotted attending school wearing surgical masks. This wasn’t hayfever season, nor were there any colds going around, so why were these teenagers covering their mouths and noses up? They were simply following a national trend for date masuku,  surgical masks that are just for show. (That's read "dah-te," nothing to do with dating.)

A journalist for Shinano Mainichi Shimbun asked students why they were wearing masks and got some surprising answers. One girl commented, “I’m shy about being seen without my makeup on.” Worryingly, another boy said, “I feel safe with it on.” Another 16-year-old female high school student explained that, “The mask hides the acne around my mouth.”

While this looks — on the face of it — like a problem created by low self-esteem, one that teenagers might grow out of, Japanese Wikipedia states that research done by Asahi Shimbun back in 2011 showed that adults are reaching for the date mask, too. Many began by using surgical masks for health reasons and then continued because they found that they enjoyed wearing a mask.