Why do you have epicanthal folds?

Look at this picture. An epicanthal fold is a skin fold from your upper eyelid that slightly covers the inside corner of your eye. Here is a good link: http://www.Nationwidechildrens.Org/epicanthal-folds. Many asian people have epicanthal folds, and in non-asians they are not uncommon. They are one of the many minor ways in which our bodies differ one from another.
Epicanthal Fold Def. An epicanthal fold refers to skin fold from your upper eyelid that covers part of the inside corner of your eye. It is most common in asians.