Apply lemon: Lemon juice acts as an antibacterial and antioxidant, which means it protects the skin from free radical damage, repairs cells, and speeds up new skin generation. It brightens tanned and dull skin, reducing the visibility of dark spots, blemishes, freckles and other sun-related damage. Squeezing some fresh lemon juice onto the palm of the hand at bedtime, much like you would use a serum or moisturiser, and rubbing well all over the hands and wrists can do the magic.