The neuro noticed swollen legs and referred me to a neuro cardiologist. They did ultrasound on my legs and groin. I got the results back today. Basically the answer is no serious problems causing the swelling. No growths or blood clots, no blood disorders. The ultrasound showed dilated veins near the skin and dilated arteries near the bones. That's why my left leg is more swollen than my right. The dilated vessels are typical of someone in their '60s. There are valves that keep the blood flowing. When these break down you get varicose veins and the muscles swell with blood that's not moving as it should.
No medication for this. His only recommendation is exercise and special socks that kinda squeeze the legs to keep blood moving.