My husband has severely cracked heels. They have been like this for as long as I have known him (so at least 7 years), and I imagine it took several years for them to get like this. There are many DEEP cracks. Can this harm him if it goes untreated? What would be the treatment for this? Is this a common problem? I have found a lot of information on what causes this and how to prevent it—but no information on how to treat it.