Cucumbers contain hydrating, nourishing and astringent properties that are very good for skin. They can improve the overall appearance of your skin by repairing damaged skin cells, removing dead skin cells and adding a fresh glow. Cut a fresh cucumber into thick slices, and rub them thoroughly all over your face. Leave it on overnight and rinse with warm water in the morning. Do this daily before going to bed.
Alternatively, make a mixture with equal amounts of cucumber juice and lemon juice. Apply this mixture to your skin, allow it to dry completely, and then wash it off with warm water. Do this daily. Source