An American have a question about Japanese.

"Why do most Japanese is wearing a mask ?"

I'll tell you the reason.

Because they are protect from a flue and a cold.

Some women have another reasons. You know, most women want to be thought beautiful, so we need much time to put on a make up, but if we wear a mask, we don't have to do it.  

The ranking of the reasons

①to hide for not wearing make up

②to keep warm of our face and skin

③to show our face smaller