Although the etiology of atopic dermatitis is not well understood, it appears to be linked to a combination of genetic and environmental factors, and it is usually associated with other atopic diseases such as asthma and hay fever. A definitive diagnosis in children and adults depends on identifying the nature and distribution of the lesions and on eliciting a personal or family history of the disease. Although no cure exists, atopic dermatitis often resolves spontaneously and can be controlled through proper management. Avoiding factors that precipitate or exacerbate inflammation is key to preventing disease flares. In children and adults, hydration and topical corticosteroids are the mainstays of therapy. Current advances in understanding the immunologic basis of the disease have led to the development of highly effective new treatments. Using patient education and support, the clinician can help adults and children successfully manage their disease.