I feel your pain
. I have had eczema a few times in my life, both times it mysteriously vanished, then about six months ago I got it again, this time BAD (always on my hands). I have exactly the same thing with the sores, pus, bleeding cracks, oh what fun.
I was determined to find the cause, and this time I tried everything, both conventional and alternative, that I could find out about. I tried an elimination diet for possible food allergy. I even did a blood test that is supposed to detect food allergy and then avoided those foods. I took fish oil and flax oil supplements, zinc, and quercitin (a natural antihistamine for allergies). I tried homeopathy, acupuncture and traditional chinese medicine. None of these things seemed to work very well, for me.
Conventionally, I used steroid cream which worked but as soon as I stopped using it the eczema came back, and I didn't want to keep using it because of the long term effects. I tried elidel which is non-steroid but found out it is an immuno-suppressant which is why I have some kind of bug right now (I quit the elidel immediately, it didn't work anyway).
A friend of my husband's had told him about lecithin, the brown sticky stuff that is made from soy. He bought me some capsules of it, which I cut open and use on my hands directly (it's pretty messy so I recommend gloves). I have been using it for a few days now and really notice an improvement--my skin seems to be healing, and yesterday it didn't hurt to shower (for months this had been a problem with open sores, etc.). So I am keeping my fingers crossed but wanted to share with you since it seems to be doing the trick.
My mother had it too when she was my age (30s) and she thinks it's from stress. I think in my case that's a possibility, since the food allergy stuff I tried didn't work. So now I'm going to try to do some meditation and massage for relaxation. Good luck to all!