What is venous stasis?

Venous stasis: The issue is one of vein hypertension, due to the impeded flow of blood returning to the heart, especially in the legs. This is due to incompetent valves in the veins. With increased blood pooling in the legs comes 'heavier' legs, swelling, pain from swelling, pitting in the skin, leakage of fluid and blood into the tissues, leakage of the fluid onto the skin causing maceration and destruction...

Skin changes: Venous stasis is caused by valve problems that allow blood from deep high-pressure veins to enter low-pressure veins just under the skin. These veins enlarge, letting fluid through the walls (swelling), letting blood through (discoloration) and finally having so much back pressure that nutritious arterial blood cannot enter an area of the skin resulting in ulcers. It is treated by laser ablation.

Valves malfunction.: Venous stasis is due to venous insufficiency which is a result of the valves in the venous system malfunctioning . This can be due to the valves in the deep system, superficial system or connecting system. Deep system valve malfunction could be due to prior clots, superficial problems could lead to varicose veins and perforator malfunction could lead to venous ulcers.