The reason for this is usually a condition called Hyperhidrosis, which is excessive sweating of the palms, plantar foot, or other parts of the body. This problem actually wicks moisture out of your tissues and dries them out. There is often a component of callus formation where the fissures and cracks form-most commonly around the heels and forefoot in the weight bearing areas. There are some good prescription and non-prescription creams that have enzymes which help to break down the callused tissue and help to soften the skin and get rid of the calluses and fissures. Over the counter, the best is called Amlactin. You can have similar cream or lotion prescribed by your Podiatrist called Lac Hydrin. These creams contain Lactic Acid, which is safe for your skin and effective against the fissures and calluses. Another type of prescription cream is a Urea cream. They work similarly. When the fissures are very bad, I have my patients apply the cream at night and wrap their feet in Saran Wrap to hold the medication close to the skin and so it does not soak into the sheets during the night. Then, in the morning, just gently go over the affected areas with a Pumice stone or a Callus File. Once the skin is normal again, you no longer have to use the Saran Wrap and can just apply the lotion nightly to the feet.