Inclusion Criteria:

Patients must meet all of the following inclusion criteria to be eligible for inclusion in the study:

1. Patients aged ≥12 years
2. Patients with confirmed diagnosis of moderate-to-severe AD as assessed by the physician
3. Patients for whom the physician's decision has been made to newly prescribe abrocitinib in usual clinical practice conditions
4. Evidence of a personally signed and dated informed consent/assent document indicating that the patient (or a legally acceptable representative) has been informed of all pertinent aspects of the study

Exclusion Criteria:

Patients meeting any of the following criteria will not be included in the study:

1. Any prior use of abrocitinib
2. Simultaneous participation in a study that includes administration of any investigational drug or procedure