Funny, I had this same problem years ago. Also, I noticed my feet had a terrible smell at that time also. Anyway, to make a long story short, I feel it was being caused by the shoes I was wearing at that time. Once I got rid of them and started wearing different ones, the problem went away. I feel certain dyes or chemicals used in the processing of the leather can cause problems, especially shoes made in other countrys. Maybe some will say i`m wrong but it sure is funny that after changing shoes my problem went away. I have also heard reports from others claiming certain laundry soaps can cause problems at times.