What happens to white lips?

The causes of children's lips whitening mainly include the following two situations: First, the body is very cold, if the amount of children wearing clothes in the cold winter is too small, it will show symptoms of fear of cold, the blood vessels around the cold stimulation will contract, especially the blood vessels around the children's lips are rich, and the lips are easy to whiten after the contraction of the blood vessels of the lips. Second, the symptoms caused by anemia, if the child's hemoglobin concentration is significantly low, it will also cause white lips, can be timely iron treatment, usually eat duck blood, chicken blood and other blood products.