I've heard organic coconut oil recommended for similar reasons. Sometimes it is a problem with fatty acid metabolism, in which case essential fatty acid/zinc supplements may help over time. If you can figure out particular triggers, then it gives you something to avoid.
What takes care of me for months at a time is homeopathy. My homeopath finally figured out the specific remedy that I need (which means it doesn't translate to help anyone else). Eczema is a chronic condition, and western medicine simply isn't geared to make much of a dent in it. Don't be too hard on your dermatologist, it isn't something he is likely to ever be able to cure.
Good luck!