Purple coloring of the lower eyelids in children may be related to sleep deprivation, or it may be caused by allergic rhinitis, heart disease and so on. 1. Lack of sleep: If a child is sleep deprived for a long period of time, resulting in poor local blood circulation around the eyes, it may cause purple coloring of the lower eyelids, which may also be accompanied by eyelid swelling, dry eyes and other uncomfortable symptoms. 2. Allergic rhinitis: If the child suffers from allergic rhinitis, resulting in increased nasal secretions, resulting in poor ventilation, especially at night when sleeping, often open-mouthed breathing, which affects the quality of sleep, it may also cause the child’s lower eyelids are cyanotic. 3. Heart disease: congenital heart disease, myocarditis and other diseases, because the heart ejection volume and output is insufficient, the child may appear hypoxia, which can be manifested in the lower eyelids purple, but also accompanied by chest tightness, shortness of breath and other manifestations. It is recommended that children with obvious cyanosis of the lower eyelids be seen promptly for evaluation of their condition and treatment in accordance with medical advice.