Why is the skin dark and healthy?

Generally speaking, black is healthy. If it is too dark, if it is born so dark, it is genetic factors that cannot be changed, so it is not unhealthy. If you get tanned the day after tomorrow, it means that there is too much solar radiation, which leads to aging of skin tissue and blackening of skin color. In this case, if there is any disease, it may be obvious from various situations, and it is not bad. At least you can know what's wrong with you, so dark skin is generally healthy. Remember to adopt ~