The purpose of this study is to determine the efficacy results in terms of percentage improvement of the Eczema Area and Severity Index (EASI) as well as on the scale Patient Global Assessment (PGA) throughout the follow-up of patients undergoing subjected to systemic and/or biological treatments in conditions of usual clinical practice. Likewise, collect safety data, recording adverse events related to medication.

This is an observacional follow-up study, open-label (all people know the identity of the intervention), prospective (study following participants forward in time), multi-center study in adult participants with moderate to severe atopic dermatitis. A registration can also be made retrospective data from the patient's medical history.

Participants will be treated with one of this therapy (phototherapy, cyclosporine, methotrexate, azathioprine, mycophenolate, dupilumab, baricitinib, upadacitinib or tralokilumab).

A series of variables will be measured (basal surface area affected (BSA), Eczema Area and Severity Index (EASI), numbers of shoots, analytical determinations and current treatment and adverse effects occurred) in order to observe the changes in the improvement of the disease. Questionnaires will also be carried out to analyze whether the drug acts favorably in improving the disease. Questionnaires like Dermatology Life Quality Index (DLQI), Patient Global Assesment (PGA) and Patient Oriented SCOring Atopic Dermatitis (PO-SCORAD).

Inclusion Criteria:

• Over 18 years.
• Patients treated with any systemic therapy (other than topical therapy) according to criteria clinical and routine clinical practice. Therefore, the treatments included will be: phototherapy, cyclosporine, methotrexate, azathioprine, mycophenolate, dupilumab, baricitinib, upadacitinib and tralokilumab.
• Patients who grant informed consent.

Exclusion Criteria:

• Patients who do not have the necessary comprehension capacity to understand and sign the informed consent.
• Patients who, according to routine clinical practice, require only topical treatment.

The study population would be patients older than 18 years who suffer from the disease and are being treated with a systemic therapy.