How-To: Heal Cracked Heels Warm weather inspires many of us to wear flip-flops and walk barefoot. When your feet are exposed to air, it can cause dry skin on your feet, which will create calluses. The pressure of pounding your feet on the ground when you run can then lead to heel fissures, or cracks in the skin. They most often occur on your heels, but you can get them anywhere you have extremely dry skin. Here are some tips from Fit on treating these sore spots.