Four-year-old children have too much dandruff, which may be related to physiological reasons such as fast metabolism, or pathological reasons such as ringworm and psoriasis. 1. Physiological reasons: a small child’s metabolism is faster, which can lead to constant shedding of the skin cuticle, manifested as too much dandruff. 2. Tinea capitis: when the skin on the head is infected by fungus, the scalp can be scaly, hair loss, itching and other symptoms, which can also cause increased dandruff in children. 3. Psoriasis: mainly manifested as red skin spots and plaques, covered with silver-white scales, can also appear more dandruff. Parents are advised to take their children to the hospital in time to clarify the cause, and if treatment is needed, standardized treatment should be carried out under the guidance of the doctor.