A Study to Learn About Abrocitinib in Adult Patients With Moderate to Severe Atopic Dermatitis

The purpose of this non-interventional observational study is to learn about the safety and effects of the medicinal product (called Abrocitinib) for the potential treatment of moderate to severe atopic dermatitis (AD). AD is a long-lasting disease that causes redness and irritation of the skin. This non-interventional study is seeking participants who is eligible for Abrocitinib treatment according to the summary of product characteristics (SmPC): * Are aged at least 18 years old * Have a confirmed diagnosis of AD by a skin doctor * Decide to start treatment with Abrocitinib as part of routine clinical practice * Have a personally signed and dated informed consent document. This is used to indicate that the patient has been informed of all pertinent aspects of the study and data privacy aspects Participants will take the medicinal product as prescribed in the real-world setting. We will examine the experiences of people receiving Abrocitinib. This will help us determine if the medicinal product is effective and safe. Participants will take part in this study for 3 months. During this time, participants will be followed up from the date of their first Abrocitinib prescription for 12 months. During this non-interventional study, some participants may switch to other therapies after their initial Abrocitinib therapy. We will follow these participants further when they switch therapy to monitor their experiences. Participant documentation is expected quarterly as per standard clinical practice.