First understand that eczema is an auto immune response to perceived invaders in the body. In other words you probably have food allergies you are unaware of. Dairy, and high glutton foods are the biggest culprits with eczema so cutting down or eliminating these foods may help. There are several herbal treatments also. Probiotics help your digestive system repair and maintain itself after having to try to process foods you are allergic to and will help with improving eczema. Chamomile and licorice gels applied 2x a day have also been shown to soothe eczema and reduce redness and itching.
Yes I too wondered that years ago. So I did research. N found the best things for me. The reason I say this is cause were all differant but I drink weatgrass. ! The best it's good because it builds our amune system up ( google) it. Also hair skin n nails is good. But basically I looked up natural cures for eczema. N found so many things we can drink to help with our amune system. ;) good luck