The dandruff may be caused by physiological factors such as not paying attention to personal hygiene, or androgenic alopecia, tinea capitis and other diseases. 1. Physiological factors: If the daily cleaning is not in place or do not pay attention to personal hygiene, may lead to the appearance of scalp white a picking off dandruff situation. 2. Androgenetic alopecia: mainly manifested as hair reduction, thinning and shedding, shedding of smooth skin, often accompanied by greasy hair, dandruff increase and so on. Some patients will have a white scalp and dandruff will fall off as soon as they pick it. The cause of the disease may be related to androgens, heredity and mental factors. 3. ringworm of the head: its cause is mostly related to the skin ringworm infection, patients will appear hair loss spots, scales and hair breakage, some patients may appear scalp white a gouge off dandruff symptoms. There are many reasons for dandruff on the scalp, and after excluding physiological factors, it is recommended that the patient consult a doctor for examination to clarify the cause of the disease and then treat the symptoms.