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How to prevent chafing between your legs
Apply some alum or baby powder to your inner thighs.
Moisture can break down the top layer of the skin and make it irritated and painful. Use your fingers to smooth on a thin layer of powder over the skin that rubs together when you walk or work out.
This solution works best with light-colored clothing that won't show any smudged powder like dark clothing would. You can also carry a small container of baby powder with you and reapply it throughout the day.