Seborrheic dermatitis, also known as seborrheic eczema, is a chronic, superficial, papular, scaly inflammatory skin disease that occurs in areas where sebum is excessively secreted, and can be accompanied by varying degrees of itching. The causes of the disease are generally believed to be related to an increase in sebum secretion or changes in the chemical composition of sebum, as well as colonization and infection by Malassezia yeast. Additionally, factors such as mental stress, diet, alcohol consumption, deficiency of B vitamins, fatigue, emotional stress, and infections can all affect the occurrence and development of the disease to varying degrees. Due to the complex causes and numerous triggers of seborrheic dermatitis, it has a chronic course and can recur repeatedly.