The red blood on the legs is a manifestation of capillary dilation, which is invisible to the naked eye under normal circumstances and only manifests itself when the capillaries are dilated. Capillary dilation is the mildest and early symptom of varicose veins, and it is generally recommended to slow down the development of the disease at an early stage by improving the venous reflux in the lower limbs, wearing varicose veins stockings and taking oral medication. Why does red blood on the legs appear? This is due to the fact that in people who stand and sit for a long time or heavy physical labor, pregnant women and obese people, blood reflux occurs due to the weakened elasticity of the blood vessel wall and incompetent valves, and the refluxed blood causes an increase in the venous pressure in the lower extremities, and driven by the increase in venous pressure, the local capillaries are pressurized and appear dilated, so that red blood can be seen in the legs. If you have red blood on your legs, it is recommended that you go to a vascular surgery clinic in time to clarify the diagnosis and the stage of the disease under the guidance of a specialist, so that you can treat and delay the development of the disease in the right way.