Seborrheic dermatitis, also known as seborrheic eczema, is a chronic papular squamous superficial inflammatory skin disease that occurs in areas rich in sebaceous glands such as the head and trunk. The exact causes of the disease are still not completely clear, but it is mainly believed to be related to increased sebum secretion or changes in its chemical composition, and associated with colonization and infection by Malassezia species. Additionally, factors such as mental stress, diet, alcohol consumption, and vitamin B group deficiency can also affect the occurrence and development of this disease to varying extents. Thus, the condition is chronic and can recur repeatedly. Although seborrheic dermatitis can be clinically cured, it is prone to recurrence. Hence, it is important to maintain a regular lifestyle, ensure adequate sleep, limit the intake of polysaccharides and fats, consume more vegetables and fruits, abstain from alcohol and spicy irritant foods, and avoid various mechanical irritations. Using less hot water and strong alkaline soaps for bathing can help reduce the recurrence of seborheic dermatitis.