A hot face red is usually due to the temperature increases, resulting in facial capillary expansion, congestion and caused by this is a normal physiological phenomenon. Human facial skin is usually thin, distributed with rich capillary network, so once in the hot environment, will cause the facial capillary network and small blood vessels expansion, congestion, making the face appear red. Facial skin most of the time are exposed to the outside, the sun is too strong or high temperature, will make the face appear heat redness, this is a normal physiological phenomenon, generally do not need special treatment, usually out of the high temperature environment or wash with cool water, will soon be able to recover. If there is persistent facial redness, you should go to the hospital as soon as possible, after clarifying the cause of the disease to carry out targeted treatment, so as not to delay the condition.