Legs!!

I am 5'3 and 130 pounds. I am small on top, but I have HUGE thighs and calves. (Not from muscle, from fat) if you were to look at me from the waist down, I look very overweight but from the waist up I am in decent shape.  Recently my legs have been swelling very often with a lot of soreness, and I've also notice spider veins appearing. Does anyone know what this could be??