I strongly encourage you to try the Elimination Diet that someone already mentioned. In my own experience, I get eczema when I consume even TRACE amounts of wheat, soy, or milk.
Also, I find it is VERY important to use non-irritating soaps for laundry and bathing, and to wear natural fabrics as much as possible. In fact, most of the ingredients in commercial soaps are known irritants. When scientists are creating skin irritation in lab animals for test purposes, they use sodium lauryl sulfate, a key ingredient in regular soaps and detergents.
I wish I had learned this 30 years ago. Instead, I lived with bleeding scaly skin for years.