I didn't read the whole thread, so I don't know if others have suggested these things, but I have lived with eczema my whole life and I have a few things you can try.
1) Change whatever detergent you are using. Even if its hypoallergenic. A lot of things that are marketed as hypoallergenic still trigger my eczema, probably because it's not an allergy.
2) If you are using any lotions or creams, stop. Even if its not where the rash is, it can still trigger the rash. Again, even if they are hypoallergenic, the lotions can still affect it.
3) The creams that the doctors prescribe never really worked until they started prescribing the heavy duty stuff, which worked really well but also burned like crazy. Something that works as well, at least on me, is coconut oil. Its easily spreadable, so you don't need that much, but its safe and natural and works, at least for me.
4) Try to keep him from sweating too much. Sweat is probably the number 1 thing that starts things up.
5) Try to keep his skin moisturized, especially after bathing. My skin gets itchy if I don't put lotion on almost immediately after my shower.
6) Eczema is a never ending battle and you're doing exactly what you're supposed to. A lot of kids grow out of it and though I never did, it was worse in my childhood. But you learn to live with it. And you, as the parent, are doing a great job. Eczema is tricky and something that works for a while may suddenly stop. It can be extremely frustrating, but just know that its not permanent.
