Children need to consider the long-term lack of sleep, congenital heart disease or the possibility of localized bruising. 1. Lack of sleep: children who lack sleep for a long time or have poor sleep quality will lead to localized bruising and dilatation of the capillaries in the face, thus triggering bruising under the eyes, which can be effectively relieved by proper supplemental sleep and is not a pathological disease. 2. Congenital heart disease: some children may have congenital heart disease, which affects the blood circulation of the whole body, so it will stimulate the lower eyelids or lips to appear purple symptoms, which is caused by the low oxygen content in the blood circulation. 3. Local bruising: when children’s eyes are hit by external forces or long-term pressure will lead to capillary rupture and cause local bruising, resulting in bruising under the eyes, which is a common trauma. Children with bruises under the eyes, it is recommended to go to the hospital in time for examination, you can choose the appropriate treatment program and medication under the guidance of the doctor for relief.