I spent 5 years figuring this one out. Doctors were no help at all. Recently, I quit taking Aleve,which is naproxin, for my arthitis and inflamed joints. Within 2 weeks, my feet were cured. The itch was deep in my toes,and made me wana dig holes in them. I am sooooooo happy. Hope this may be your cause, and maybe it will help you too.