A child’s blue color around the mouth may be caused by capillary congestion or may be related to cardiopulmonary insufficiency. If this happens for a long time, parents need to take their children to the pediatric department of the hospital for a detailed examination and determine the treatment measures according to the examination results. Common causes and treatments 1, capillary or venous reveal: the skin around the child’s mouth is delicate, the dermal tissue is thin, the capillaries under the skin are rich, when the capillaries are congested, they show through the skin and look green around the mouth; 2, congenital heart disease: children with congenital heart disease, if there is a large ventricular septal defect or atrial septal defect, it is easy to have poor blood circulation and The common symptom of hypoxemia is blue around the mouth. Parents should promptly take their children to the hospital for cardiac ultrasound examination and, if necessary, surgical treatment; 3, cardiopulmonary insufficiency: children with severe pneumonia combined with heart failure, or respiratory obstruction disease, easily due to tracheal spasm caused by hypoxia, resulting in the symptoms of blue around the mouth. Parents can take their children to the hospital for oxygen to improve the symptoms, and if necessary, take a CT examination of the lungs and larynx to clarify the diagnosis and treat the primary disease. If your child has this symptom and it does not go away, or if there are other abnormalities, you need to seek medical attention to clarify the cause.