This thick dairy product makes a moisturizing mask and gentle exfoliant, since its lactic acid (an alpha-hydroxy acid) helps speed cell turnover, brightening dull complexions. Natural fats restore skin's moisture. Don't use this trick on an oily face.
Using your fingers, smooth 1 to 2 tablespoons of cool, full-fat sour cream in a thin layer over your clean face and neck, avoiding the eye and lip areas. Wait 7 to 10 minutes, then remove the mask with a wet washcloth. Splash skin with warm water and pat dry.