Children who have lost a piece of hair are considered to be related to baldness, tinea capitis and other diseases. 1. Pemphigus: Pemphigus, commonly known as ghost shaving, is limited, patchy, non-scarring hair loss. The causes of baldness are complex, and are related to heredity, androgens, autoimmunity, etc., which may lead to the phenomenon of children’s hair falling out in patches. 2. Tinea capitis: Tinea capitis is caused by fungal infection, red spots on the scalp, dandruff, etc. After the fungus destroys the hair follicles, local hair loss will also occur, resulting in patchy, scarring alopecia, which may lead to children’s hair loss phenomenon. In addition, children often stay up late, poor quality of sleep, usually too much pressure to study, can cause psychosomatic diseases, and even cause anxiety, depression, etc., at this time may also appear the phenomenon of hair loss. If the child has a piece of hair loss, it is recommended that parents take the child to the regular hospital dermatology or pediatrics for examination, clear diagnosis and standardized treatment in accordance with medical advice.