The cause of baldness in children is not clear, it may be immune factors, genetic factors, mental factors, infection or allergies. 1. Immune factors: hair follicle immune immunity mechanism is destroyed is the key to the onset of baldness, baldness is often combined with such as vitiligo, dry syndrome, hyperthyroidism and so on. 2. Hereditary factors: If parents have baldness, the chance of children suffering from baldness will increase, this disease has a certain family heredity. 3. Mental factors: long-term mental stress, or anxiety, mental stimulation, etc. will affect the body’s endocrine system, baldness. 4. Infection: If children have fungal infection or influenza, etc., it will lead to the decrease of body immunity and the appearance of baldness. 5. Allergy: some patients with baldness have elevated levels of total IgE, suggesting that the disease may be related to allergies. There may be other reasons for children’s baldness, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and then give targeted treatment or therapy.