These venous ulcers, or stasis ulcers, develop when the leg veins fail to pump blood back up to the heart for reoxygenation. Which is what we call, venous insufficiency.
The veins in your body have valves that open one way to allow blood to flow back to the heart. However, age and other factors influence how well the valves function over time.
When the valves break down, the blood begins to pool, and then the veins begin to leak fluid into the surrounding tissue. This fluid will begin to break down the tissue and will cause ulcers to form.
Diabetes can also cause ulcers and sores on the legs, but the causes are much different from vascular causes.
Leg discoloration is another symptom of venous insufficiency. It can also be caused by diabetes, but here we will focus on discoloration from venous conditions.