My Feet keep sweating and I'm loosing a lot of skin on them. Its like holes and I don't know why?

After I get off work from walking around inside all day I come to find out when I get home my feet were sweating horribly. When I take a look at my sore feet I find very white skin with holes in them about a couple millimeters deep. The Holes can size up to about a pebble in diameter and like I said can be a couple millimeters deep. It's very annoying and I cant stand it much longer. It's been like this for about a couple of years off and on and now it seems to be back for good. The holes will be hard and normally all filled back up when I awake the next day. I walk somewhat on my toes and yet I still have the holes on my heels and the rest of my feet EXCEPT the arch in my foot. Please give me a reason to as why this is happening. Give me a good explanation!