Dandruff on the head of an 8-year-old girl is considered a normal phenomenon, seborrheic dermatitis, tinea capitis and so on. 1. Normal phenomenon: 8-year-old girls are growing and developing period, the body’s metabolism is relatively fast, the scalp is also metabolism, there will be keratin shedding, the formation of dandruff. 2. seborrheic dermatitis: seborrheic dermatitis is a chronic inflammation that occurs in the seborrheic overflow area, the cause of which is not particularly clear, if seborrheic dermatitis occurs in the head, the patient will appear chaffing dandruff, when combing the hair, there is a large amount of grayish-white dandruff, and if accompanied by inflammation there will also be oily dandruff, and there is mild itching. 3. Tinea capitis: Tinea capitis is an infectious disease caused by dermatophyte infection of the scalp and hair, which may be caused by close contact with people suffering from tinea capitis, or close contact with diseased animals, and is manifested as limited white, grayish-white scaly patches on the head and arms. Dandruff on the head of an 8-year-old girl, there may be other reasons, it is recommended to go to the hospital in time, by the doctor to clarify the cause of standardized treatment.