Many of us suffer from dark circles under the eyes as we grow older. Grated potatoes can lighten under-eye circles. Potatoes contain an enzyme called catecholase, which is used in cosmetics as a human skin lightener.

Run one spud through your food processor and stuff the raw mash into a piece of cheesecloth.
Apply to the area directly beneath your eye. Be sure not to let the potato juice come in contact with the eye itself and leave it on for 15 to 20 minutes. Then wipe away the starchy residue

(undereyecircles.org)