At one point, my feet had been described as "smelling like death". Looking at the bottom of them, I saw little pockets. After a little searching I found out it was Pitted Keratolysis which is easy to fix in a little over a week. Google pitted keratolysis and you can find a number of sites. The short explanation is this:
Symptoms: Your feet smell like death and they have little craters in them
Treatment: Over-the-counter topical antibiotic applied to infected area, change shoes and socks often, spray out climbing shoes after every use (the little bacteria that start it can live in the shoes making treatment difficult).
Hope that helps