Sudden exercise may lead to pressure purpura. Normally, if there is a lack of exercise, sudden strenuous exercise will cause abnormal local muscle contraction, resulting in increased pressure on the capillaries, which may cause the rupture of small subcutaneous blood vessels, leading to the appearance of pressure purpura. There may be symptoms such as bleeding spots on the skin and ecchymosis of the skin, usually without pain or itching. Pressure purpura generally does not require special treatment, pay attention to rest, pay attention to hygiene, eat more vegetables, drink more water to promote metabolism, most will recover by themselves. Usually exercise should be gradual, the amount of exercise gradually add, avoid a one-time exercise too much, so as not to cause muscle ligament strain and other abnormal symptoms. If the symptoms have been difficult to relieve, or other discomforts, you should consult a doctor in time.