Dark Spot Remover Recipe Buttermilk contains lactic acid that has a gentle peeling effect which lightens skin without irritating. While lemons are a natural bleaching agent. When used on your skin it gives a lightening effect that works well with blemishes and brown spots. The citric acid in lemons helps to close pores and helps skin maintain a healthy glow. Strawberries also contain salicylic acid, which help to remove dead skin cells.