I’ve noticed a lot of people with eczema on this sub come to realize that it’s something in their diet (I think dairy is often a culprit) that triggers flareups. So you might want to try to use fasting as the start of an elimination diet.
The best thing I found for eczema is a vegan, whole food diet and totally cutting out alcohol. I tried a ton of elimination diets and all kinds of eczema diets. Fasting didn’t help too much that I noticed. It seems to be such an individual thing. It can’t hurt to try fasting though. You never know.