The BioDay Registry aims to address the need for daily practice data regarding the effectiveness and safety of new systemic treatment options (like biologics and Janus kinase inhibitors) in patients with atopic dermatitis and effect on other atopic comorbidities in a multicenter setting. The registry already consists of several additional modules concerning atopic comorbidities, like food allergy and asthma, and a module for conjunctivitis during biologic treatment.