Hi,
I'm Japanese.
We wear a white mask because we don't want to spread any germs that we've caught to other people.
For example, when we have a cold, we cough a lot. So we wear a white mask. When we have some allergies, we cough a lot. So we wear a white mask. It's just a simple reason to wear this white mask.
But some people wear a mask to hide their face before they commit a crime. These people usually wear sunglasses, a white mask and a cap/hat:
http://oponchieli.blog.ocn.ne.jp/oponchi…
But even though people are not criminals, some of them are mistaken as criminals because they look like one by wearing a white mask, sunglasses and dark clothes like the picture above :)
But basically we wear this white mask for not spreading any germs.
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