[header] How to prevent chafing between your legs [title] Apply some alum or baby powder to your inner thighs. [step] 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. 
[substeps] 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.