Skin immune system (SIS).- Immunological aspects of allergic inflammation: IgE regulation.- The role of T cells in the pathogenesis of atopic dermatitis.- Immunological aspects of allergic inflammation: eosinophils.- Mast cells.- Cell-to-cell interactions.- Atopic dermatitis.- Allergic contact dermatitis: cosmetics.- Clinical aspects of occupational contact dermatitis.- Clinical aspects: urticaria.- Clinical aspects: drug allergy.- Future developments in treatment of atopic dermatitis.