Seborrheic dermatitis, also known as seborrheic eczema, is a chronic papular scaly superficial inflammatory skin disease that occurs in areas with excessive sebum secretion. It is common in adults and newborns, often occurring in sebaceous gland-rich areas such as the head, face, and trunk. The causes of the disease may be related to increased sebaceous gland secretion or changes in the chemical composition of the sebum. It is also associated with colonization and infection by Malassezia yeast. Factors such as stress, diet, deficiency in B vitamins, and alcohol consumption can also affect the occurrence and development of this disease to varying degrees. The characteristic rash starts as follicular papules, which gradually enlarge and merge into dark red or yellow-red patches, covered with greasy scales or crusts. Exudation, crusting, and erosion may occur, presenting eczema-like symptoms, and can be accompanied by varying degrees of itching.