Neonatal bruising is one of the most common symptoms of neonatal period, but do not be too careless, once a patient was born after the lips have been some bruising to black, at that time only to listen to the previous generation said that it is black jaundice, it’s okay, after some time will be fine. In the end, the child became more and more serious, only to realize that it was congenital heart disease. When a normal newborn is just born, bruises are easily seen around the mouth, palms, toes and nail beds, etc. This is due to the fact that the ductus arteriosus and patent foramen ovale have not yet been closed, still maintaining a right-to-left shunt, the lungs have not yet been fully dilated, and the lungs have imperfect ventilatory function, as well as poor peripheral skin blood flow perfusion. After a few minutes, the changes in the circulatory system are complete, the arteriovenous blood flow is completely separated, and the lips and nail beds turn pink. Cyanosis is one of the common symptoms in the neonatal period and is caused by an increase in reduced hemoglobin in the capillary blood of the newborn above a certain level. It is generally believed that cyanosis can be detected with the naked eye when the arterial blood reduced hemoglobin level is greater than 50 g/L, and cyanosis of the mucous membranes of the lips and mouth is the earliest to appear. It can be caused by a variety of reasons and can occur in pulmonary, cardiac, hematologic, and central nervous system disorders, as well as in a small number of normal newborns. The primary cause of cyanosis can be very mild, or it can be so severe as to be life-threatening. The presence of cyanosis on a baby’s white skin and reddish mucous membranes is not necessarily due to congenital heart disease, but may also be due to other conditions. Baby skin bruises, there may be these diseases 1, congenital heart disease: children with tetralogy of Fallot or large blood vessel dislocation and other congenital heart disease, blood circulation within the heart disorders, venous blood mixed with arterial blood, a large number of carrying metabolic wastes of venous blood into the arteries and make the body appear hypoxia, so that the skin, mucous membranes, and nails and other parts of the bruises. After the disease, the child is often reluctant to move, once the activity or crying, breathing faster, will also appear bruises, or manifested as restlessness, can not sleep flat. For this kind of congenital heart disease, as long as the diagnosis is correct can be surgically treated. But there are also many congenital heart disease is no symptoms of cyanosis. 2, intestinal cyanosis: children such as eating spoiled vegetables, or mother eating spoiled vegetables, babies through sucking breast milk is prone to methemoglobinemia, so that hemoglobin loses the ability to carry oxygen, hypoxia occurs, cyanosis, medically known as “intestinal cyanosis”. The main manifestation of the lips and mouth mucous membrane and the whole body skin cyanosis. This kind of cyanosis as long as the timely detection, intravenous injection of drugs such as melphalan, the symptoms will disappear. 3, lung disease: children with pneumonia, emphysema, laryngitis, asthma and bronchial inhalation of foreign bodies and other diseases, will varying degrees of impediment to gas exchange. These children in addition to skin cyanosis, there can be dyspnea, open and close the nose, pallor and cough and other symptoms. As soon as the primary disease is cured, the symptoms of bruising disappear. The main causes and symptoms of skin bruising 1, insufficient warmth: children’s facial skin after freezing, can make the small arteries contraction, bruising, this bruising in the warmth can quickly disappear. 2, delivery pressure: in the maternal delivery, the newborn baby a local pressure, localized bruises on the skin, this is not a purple birthmark, in general, this bruise will gradually disappear. 3, immature newborns: immature children are newborns weighing less than 2500 grams at birth, there may be paroxysmal bruising after breastfeeding, accompanied by apnea. 4, pediatric physiological diseases: if the newborn skin cyanosis, and this cyanosis was blotchy blue-red, uneven distribution, lasts for about 2 weeks and gradually disappear, may be the neonatal erythrocytosis; if infants and young children with persistent cyanosis, may be cyanotic congenital heart disease; if the lower limbs of the child and the upper limbs are not cyanotic, may be the aortic constriction and congenital with the arterial catheterization. If the child’s upper limbs bruises heavily but the lower limbs are light, it may be the symptom of large vessel dislocation with arterial catheterization; if the child has difficulty in breathing and accompanied by the appearance of skin bruises, it may be suffering from tracheal, bronchial or pulmonary diseases.