Atopic dermatitis (AD) is a frequent chronic relapsing inflammatory skin disorder, characterized by intensely itchy eczema. AD usually starts within the first 2 years of life. In 30 - 60% of children, inflammation spreads onto other body surfaces such as the gastrointestinal tract, the respiratory tract, and the conjunctives within a few years. This sequence is called atopic march.

Atopic dermatitis and associated atopic diseases are more frequent in families, suggesting a genetic predisposition. However, the underlying factors such as genetic phenotype, environmental factors, or life style which cause or worsen an existing allergic disease are not understood yet. Affected people suffer from recurrent flares that result in significantly impaired quality.

This study will collect clinical and laboratory data to elucidate immunotolerance and preventiv stategies with the aim to develop new and individual treatment options of atopic diseases.

Primary Objetive:

In the planned project, the main objective is to identify endogenous (e.g. immunological and molecular factors) and exogenous factors (e.g. environmental, socioeconomic and microbial factors) that influence the course and remission of AD. More specifically to identify factors that are significantly different between patients that have or do not have remission from AD.

Secondary Objective:

(i) To identify endogenous and exogenous factors such as immunological, molecular and microbial factors to separate subgroups of patients (endotypes) with distinct local and systemic inflammatory responses.

(ii) To identify potential biomarkers predicting the individual clinical course of AD and other atopic diseases including asthma, food allergy and allergic rhinitis.

Inclusion Criteria:

• Age 0 - 85 years
• Diagnosis of AD and/or another disease of the atopic group (i.e. allergic rhinitis, allergic asthma, food allergy)
• The inclusion of patients in this study is independent from the current therapy. During the study all patients will be kept on a therapy that is medically indicated

The inclusion criteria for healthy controls in this study are as follows:

• Age 0 - 85 years
• No diagnosis or history of allergic disease
• The inclusion of patients in this study is independent from the current therapy. During the study all patients will be kept on a therapy that is medically indicated

Written consent will be obtained after detailed information of the study was given to the participant.

Exclusion Criteria

- Unable to give consent or refusal to participate in the study

All patients with atopic dermatits, any other allergic diseases and /or healthy controls