Venous diseases begin imperceptibly. At first, capillary networks are observed in the skin of the legs, then venous nodules appear. Varicose veins develop when the valves of the veins begin to function poorly. Then the pressure in the veins begins to increase, and due to this pressure, the valves are damaged even more. The composition of the blood in the veins progresses, other previously intact valves also lose their tightness. When the valves in the veins malfunction, the blood stagnates, which increases the blood pressure in the veins. As a result, the veins expand, lengthen, and subcutaneous nodes are formed.