In some people, excess skin in the upper eyelids causes the face to look as though the person is scowling, when in fact her face is simply at rest.  That's because when you scowl, you lower your eyebrows, bunching up the skin on your upper lids.  If your upper eyelid skin is bunched up all of the time simply because it is in excess, you might look like you are scowling all the time.