Patients with particularly high levels of dandruff may be suffering from environmental factors and seborrheic dermatitis. It can be solved by improving lifestyle and medication. 1. Environmental factors: prolonged exposure to ultraviolet rays, dust in the air or dry weather can dry out the scalp and cause a lot of dandruff. It is recommended to wash your hair diligently and avoid prolonged sun exposure. Avoid the use of hair products such as hairspray, coloring agents or irritating shampoo products. 2. Seborrheic dermatitis: its occurrence is related to Malassezia infection, sebum secretion abnormality, immune factors, etc. It can be manifested as chaff-like dandruff, and there is a lot of grayish-white dandruff when combing hair. It can be treated with topical ketoconazole lotion, oral itraconazole and other antifungal drugs to relieve symptoms. In addition, it is recommended that patients with particularly high dandruff go to the hospital in a timely manner, to clarify the cause of the disease and then follow the doctor’s instructions for treatment, to avoid delaying the condition.