One common factor in 90% of our clients who present with eczema is a heavy consumption of white bread.
Cutting out yeast containing foods like the common ones bread and beer/wine usually clears the problem.
Dairy products is the second most common allergic cause. When you consume dairy, there is such a high dose of bacteria that your immune system goes into overdrive leading to inflammation of the entire body which then becomes evident on the skin of the face.
Of course if like most people you love bread,beer,wine, cheese etc. you can still enjoy these things in moderation, but to minimise the allergic inflammation, take a natural anti inflammatory like evening primrose oil at the same time.