James Q. Del Rosso, DO, FAOCD; Grace K. Kim, DO

Introduction
Seborrheic dermatitis (SD) is a common inflammatory dermatoses that may affect infants, adolescents, and adults of all ethnicities and races.[1,2] SD exhibits two incidence peaks, one during infancy, and the other during the fourth to sixth decades of life.[3] The prevalence of SD ranges from 1 to 5 percent in the immunocompetent population and increases in the immunocompromised population, especially among patients with acquired immunodeficiency syndrome (AIDS).[2–4] Infantile SD occurs between the second and tenth week of life and peaks at three months of age.[4] Infantile SD is distinguished from adult or adolescent SD in that the infantile form is almost always confined to the first 3 to 12 months of life, while adult SD is characteristically chronic and relapsing throughout life.[5] SD can also present in association with other skin disorders, such as atopic dermatitis (AD), which can often create diagnostic confusion. In one study, 49 percent of children with AD between the ages of 2 to 12 months had a history of infantile SD as compared to 17 percent of controls.[4] SD has also been observed in conjunction with other skin diseases, such as rosacea (rosacea-seborrheic dermatitis overlap), blepharitis, acne vulgaris (AV), pityriasis versicolor, and Malassezia folliculitis.[6–9] Read the rest of this article »