A Study to Determine Serum and Skin Biopsy Biomarkers in Patients Receiving Topical Corticosteroid (TCS) and Following TCS Withdrawal

Inclusion Criteria:

1. Male or female patients 18-75 years of age

2. AD diagnosed by the Rajka/Hanifin criteria at the time of screening and that has beenpresent for at least 1 year

3. History of inadequate response to a stable regimen of TCS for 1 month (in the 3 monthsimmediately preceding the screening visit) as treatment for their AD

4. Eczema Area and Severity Index (EASI) score ≥ 14 at the screening and baseline visits

5. Investigator's Global Assessment (IGA; 5-point) score ≥ 3 at the screening andbaseline visits

6. ≥10% body surface area involvement by AD

7. A washout period prior to screening for those patients who have previously receivedthe following medications:

• Cyclosporine/Oral Steroids/Imuran/Mycophenolate Mofetil/Other systemicimmunosuppressants: 4 weeks

• Phototherapy: 4 weeks

• Biologics: 5 half lives of the drug

Exclusion Criteria:

1. Evidence of other concomitant skin conditions (e.g., psoriasis or contact dermatitis)

2. Use of topical calcineurin inhibitors within 4 weeks of screening

3. Hypersensitivity to TCS or to any other ingredients contained by the emollient or TCSproduct used during the study

4. Evidence of active skin infection at screening or baseline visit

5. Evidence or history of active or latent infections such as tuberculosis or hepatitis C

6. Patient clinical condition is not appropriate for treatment with protocol prescribedTCS

7. Use of an investigational agent within 4 weeks prior to screening or within 5half-lives of the investigational agent, whichever is longer

8. Use of a tanning booth/parlor within 4 weeks before the baseline visit

9. Use of any anti-histamine medication within 4 weeks before the baseline visit.

10. History of any condition (e.g. bleeding diathesis) that may predispose the patient tocomplications associated with the planned skin biopsy procedures

11. Known current malignancy or current evaluation for a potential malignancy, includingbasal or squamous cell carcinoma of the skin or carcinoma in situ

12. Other clinically significant medical disease that is uncontrolled despite treatmentthat is likely, in the opinion of the investigator, to impact the patient's ability toparticipate in the study or to impact the study pharmacodynamic (PD), or safetyassessments

13. Unwillingness or inability to comply with the study protocol for any other reason.