Red lips in children may be related to physiological factors such as skin color, heredity and so on, and may also be related to pathological factors such as vitamin deficiency, microbial infections and so on. 1. Physiological factors: due to the different skin color of each person, heredity and other factors, there is a difference in the color of the lips, resulting in the appearance of children with red lips. 2. Pathologic factors: (1) vitamin deficiency: due to the lack of vitamin B, vitamin E, resulting in affecting the growth and division of mucous membrane and skin cells, the lip tissue layer becomes weak and chipped, resulting in the appearance of children with red lips. (2) microbial infection: daily not pay attention to the care and hygiene of the lips, lips dry and cracked, the formation of small cracks, easily induced bacterial and viral infections, resulting in lip capillary expansion, resulting in the emergence of children with red lips. Therefore, there is no need to worry too much about the red lips of children, if in addition to the red lips are accompanied by other symptoms, it is recommended to choose to seek early medical attention to identify the cause.