Why does the skin look better and whiter in colder places?

The colder the place, the better the skin is for the following reasons: (1) the sunshine time is short, the skin is not easy to sunburn; (2) the air in cold places is generally moist, and the skin is not easy to lose moisture; (3) cold It snows easily in this place, and the white snowflakes are contagious. It's the same reason as those who are close to their feet are naked. (4) In cold places, the nights are longer. People sleep for a long time and can get sufficient rest. As the saying goes, Sleeping Beauty.