While I believe I had a problem with dehydration from an intestinal condition I had called celiac disease, I think the bigger problem causing my EC was a malabsorption problem. I wasn't absorbing vitamin A and was low on zinc...if you are deficient in one, you are usually deficient in the other. I had low absolute CD8 T suppressor cells, which low zinc causes. Taking zinc supplements increases these T cells. Low zinc affects the skin barrier or makes it harder to fight infections on skin barrier and vitamin A deficiency creates hyperkeratinization in lips. I think somehow increasing your zinc levels also increases your vitamin A level. Since my absolute CD8 T suppressor cells are now in the normal range, I believe that's why I'm cured. It's all in the immune system...for me at least.
I wish I knew what I know now decades ago. I guess I'm eager to get right to the cause instead of wasting all the years I have trying to manage this condition.