Seborrheic dermatitis, also known as seborrheic eczema, is a chronic papular and scaly superficial inflammatory skin disease that occurs in areas where sebum is excessively secreted. It commonly affects areas rich in sebaceous glands such as the head, face, and trunk, and is more frequently seen in adults and newborns, often accompanied by itching of varying degrees. The exact cause of this disease is not completely understood; however, it is generally believed to be related to an increase in sebum secretion or changes in its chemical composition. Additionally, colonization and infection by Malassezia yeast play a certain role. Other factors such as mental stress, diet, deficiency in B vitamins, and alcohol abuse also influence the occurrence and progression of the disease to varying extents.