Most importantly, dark skin is adaptive at low latitudes. Which is why calling it a disease is completely wrong, though understandable from 19th century point o

Most importantly, dark skin is adaptive at low latitudes. Which is why calling it a disease is completely wrong, though understandable from 19th century point of view. It is a hereditary adaptation. That it is malpractice at high latitudes means little. Much like sickle cell trait is adaptive where malaria is endemic. This is why even Caucasians there, especially ones who lived there for generations, are quite brown. (Say, Arabs.) People who aren't dark skinned enough tend to get sunburnt.