Elevated IgE levels are associated with early hypersensitivity when an allergic reaction occurs within a short time after contact with an allergen (e.g. asthma, atopy, parasitic infection, and food allergies). The exact role of IgE in atopic dermatitis continues to be researched and analysed. Genetic factors which may cause the dysfunctional regulation of IgE, atopy, and higher IgE levels have already been identified.