The prevalence and severity of atopic dermatitis (AD) changes with age. 1 The prevalence of AD and other atopic diseases such as asthma and hay fever has been steadily increasing since the second half of the 20th century, reaching a plateau in the late 1990s in Europe, Japan, and Australia. 2-5 However, these prevalences were mainly determined in children, and few studies have examined the prevalence of AD over time since 2000. As a result, the current prevalence and severity of AD in adults are unknown. Additionally, there are few reports of physician-led epidemiological studies of AD in adults, and the actual status of diagnosis and treatment of AD in adults who do not visit hospitals is unknown. In this study, we conducted a survey of university students by dermatologists to clarify the trends in the prevalence of AD in adults, which were lacking in previous epidemiological studies of AD. We also surveyed their current hospital visits and the diagnoses they received in hospitals and investigated the relationship between these and the severity of AD.