What Causes Numb Toes And Brown Swollen Spots On Right Leg?

I am 43 years old I've been getting brown spots on my right leg lower leg for about six months and now they're swollen in the side of my foot is turning black my doctor put me on a diuretic but it didn't help also mentioned venous deficiency and my foot is numb but just the right side like three toes YYYY@YYYY