What Causes Dark And Dry Skin With Wrinkles?

hi suddenly frm last 1 month my skin is getting very dark & dry.........my hands skin look like wrinkle ful.........my age is 28th. sudden darkness of skin is it because of any vitamin deficiency?? 1 more thing want to tell..........i wont use soap in my face........i use BESAN for my face. but i have habbit of drinking cooked rice water daily..........is the darking because of that........pls help