- treatment with systemic or locally acting medications which might counter or influence the study aim (e.g. antihistamines or glucocorticosteroids) within two weeks before study day 1and throughout the study period (exception: asthma may be found in patients with atopic eczema, therefore inhalation with corticosteroids in patients with asthma accompanying atopic eczema will be allowed at a dose not exceeding 1 mg/day. The dosage should remain constant throughout the study period);