If it takes a few days to recover, there are certain obstacles to blood return. In this case, it is necessary to adjust the training intensity, reduce the training times and make the circulatory system adapt to the exercise.
Blood flows to the capillaries of the skin for microcirculation. This is a good thing, but if blood stays in capillaries for a long time, it will affect the blood circulation of the whole body; Second, it will block the circulation of capillaries and form lesions of skin and capillaries.
Therefore, we should pay attention to this symptom and adjust it in time to prevent sports injury.