When the valves in the veins do not work properly, blood cannot travel up the leg against gravity. In fact it may leak backwards and pool in the legs – Superficial Venous Reflux.
This increases the pressure in the veins which causes fluid to leak into the tissues of the leg – Venous Oedema.
Varicose Eczema is probably an immune response to the excess fluid and this results in an inflammatory reaction in the skin.