To investigate the superiority of 1% OPA-15406 foam to the vehicle in adult patients with atopic dermatitis (AD).
Participants who have been diagnosed AD based on the Diagnostic Criteria for Atopic Dermatitis (Criteria of the Japanese Dermatological Association)
Participants with a history of AD for at least 3 years
Participants who have an affected area covering from 5% to 40% of their body surface area (excluding the scalp) at the screening and baseline examinations
Participants with an IGA score of 2 or 3 at the screening and baseline examinations
Participants who experienced an acute exacerbation of AD or contact dermatitis within 28 days prior to the baseline examination
Participants who have been treated with OPA-15406 ointment in the past