Lemon, glycerin and rosewater

hay i hav aproblem ov dark joints of my feet,armz elbow ankal and hand fingers im sooooooooooooooooooooooooooooooo worried abt the darkness ov my feet and armz plzzzzzzzzzz help me help is this totka effective or cn u poeple recommend me any other totka for my problem my wedding is near:(((((((((((((((((((