The main reasons for bruises on women are the following: 1, the carbon dioxide content in the blood is high, the blood is dark red, the oxygen content is low, the blood vessels are more obvious on the skin, and they look blue, which mostly suggests poor blood circulation or poor lung function. 2, varicose veins are more likely, especially the superficial veins of the lower limbs are prominent and show bruises, which need to be examined under ultrasound. It is necessary to determine whether the venous blood flow is impaired or the formation of venous thrombosis, which requires symptomatic treatment under the guidance of a doctor. Severe bruising, that is, severe venous stasis, embolism and varicose veins in the lower extremities, requires surgical adjustment.