what causes eczema
1 Eczema is not a single disease but a reaction pattern of the skin produced by a number conditions. 2  Atopic dermatitis, a common causes of eczema, is more prevalent in those with asthma and hay fever. 3  Eczema appears as small blisters that can weep and ooze, or as crusted, thickened plaques of skin. Atopic dermatitis, a common causes of eczema, is more prevalent in those with asthma and hay fever. 2  Eczema appears as small blisters that can weep and ooze, or as crusted, thickened plaques of skin.