Seborrheic dermatitis is a chronic inflammatory skin disease that occurs in seborrheic areas such as the head, face, chest and back, and may occur in the summer months, and can recur. The cause of seborrheic dermatitis is unclear and is associated with genetics, Malassezia infection, and diet. It often presents as an erythematous rash, often with greasy scales or scabs attached to the surface, and may recur, with triggers such as fatigue, emotional stress, and infection. Seborrheic dermatitis may occur in summer. It is recommended that patients go to the dermatology department, life should pay attention to the regularity of life and work, to ensure adequate sleep, to limit the diet of sugar and fat, avoid spicy and irritating food. Under the guidance of the doctor can be used externally sulfur, selenium disulfide lotion, etc., but also depending on the circumstances of oral antihistamines such as loratadine, antibiotics such as tetracycline, azithromycin and so on.