Seborrheic dermatitis, also known as seborrheic eczema, is a chronic, papular, scaly, superficial inflammatory skin disease that occurs in areas of sebaceous secretion. It commonly affects the head, face, chest, and back—areas rich in sebaceous glands—and is more frequently observed in adults and newborns. It may be accompanied by varying degrees of itching. The onset of this disease is generally believed to be related to increased sebum secretion or changes in its chemical composition. Additionally, colonization and infection by Malassezia yeast, as well as factors such as stress, diet, deficiency in B vitamins, and alcohol consumption, also variously influence the occurrence and development of the disease.