On my right foot, there's a small callus with redness extending a millimeter or so around it, and it's been like that for a few years now. I don't know what's causing it, but I have some ideas. I think it may be partly from driving. I drive with my heel touching the back of my shoe, and since I don't have cruise control, I have to keep my foot like that for 20 minutes or so on my way to work and back every day. I tried driving with no shoes on, but that didn't seem to make the redness and callus go away over a several month period of time, so something else must be contributing to it as well. I tried tightening my shoe so that my heel doesn't slide on the back of my shoe when I walk, but it always seems to slide a little. I tried making it loose, but then it still slides against the back of the shoe. I have to wear shoes at work, so I was thinking maybe there's some kind of thing I could put in the back of my shoe to let my heel heal. I figure if I can keep anything from rubbing against it for a few months, it'll finally heal. Any ideas on what I could do to my shoe to stop my heel from rubbing against anything.