Redness of the face after exercise is a normal physiological phenomenon. It is caused by increased blood circulation as well as increased heat dissipation. The face is rich in blood vessels and nerves, and the skin of the face is relatively thin. After exercise, the body will secrete some excitatory nerve mediators such as adrenocorticotropic hormone, so that blood circulation increases, capillary dilation, blood flow in the blood vessels will increase, resulting in capillary congestion, heat dissipation increases, so the face will be red. The redness of the face after exercise is also related to the individual’s physical condition. People with good blood circulation are more likely to have a red face after exercise, and people with a thin cuticle are more likely to have a red face after exercise. If the redness after exercise is not uncomfortable, it can be relieved by resting for a period of time, so there is no need to worry too much.