Lactic acid is an alpha hydroxy acid, which is a group of acids naturally occurring in certain foods. These acids remove the top layer of dead skin, and are often used in commercial skin care treatments to alleviate dry, scaly, or darkened skin. Only use lactic acid products at night, as it can make your skin even more susceptible to UV damage.  Apply a thin layer of plain yogurt to your hands and feet before bed. Leave the yogurt on for five to 10 minutes, and rinse with warm water. Repeat a couple times per week. Remember that even if you do this, you will still need to wear SPF 15 or higher sunscreen during the day to prevent sun damage.
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