The presence of atopic dermatitis was confirmed by an allergic skin test. Serum biomarkers including intestinal fatty acid binding protein (I‐FABP), intestinal alkaline phosphatase (IAP), trefoil factor‐3 (TFF‐3), immunoglobulin E (IgE), interleukin‐4 (IL‐4) and interleukin‐13 (IL‐13) concentrations were measured from venous blood samples. Here, IL4 is linked to atopic eczema.