I know this is an old thread but I would like to share what worked for me so that it might help someone else. I had Dyshidrotic Eczema on my hands and feet for many years until I gave up processed sugar. The Eczema went away and it has been a year. I'm not saying it will work for everybody but it might help someone else.
It was not an easy task for me to give up foods containing Sugar as I had a very sweet tooth ( Candida Overgrowth ). I now use honey wherever I used Sugar (in coffee etc)and natural sugars like fruit are fine, it's only processed Sugar that gives me trouble. If anyone does decide to try giving up sugar I would say it's best to phase it out gradually, I went cold turkey and got pretty ill with the toxins released from the candida as it was dying off.