Dandruff in high school students may be due to seborrheic dermatitis, tinea capitis, and inadequate cleaning. 1. Seborrheic dermatitis: the etiology and pathogenesis are unclear, and may be related to Malassezia colonization, increased lipid secretions, and impaired skin barrier function. It may cause erythema of the skin with greasy flaking, and in some cases it may cause thinning or loss of hair, so it may lead to excessive dandruff in high school students. 2. Tinea capitis: a skin disease that is mainly caused by fungal infection and involves the hair and scalp. It may cause red spots on the scalp, covered with flaky scales, accompanied by hair breakage, and cause the symptoms of excessive dandruff in high school students. 3. Inadequate cleansing: not paying attention to personal hygiene, not washing hair in time, not cleaning secretions, may also lead to high school students dandruff. There may be other reasons for dandruff in high school students, you need to go to the hospital in time to check, clarify the cause of the disease, and follow the doctor’s instructions for treatment.