Hi Welcome. Pedal edema is noted with heart disease and also with hypertension. But usually it will be bilateral, involving both the leg. As you have mentioned edema of one leg, I would suggest you to see physician for examination and further help. Unilateral pitting edema is due to local causes. It can be due be due to venous insufficiency, DVT or Lymphedema. Venous insufficiency may be less likely, as in here the swelling reduce with rest. Presently I would suggest you wear support stockings. These stockings are available in most drug stores. Elevate your legs as much as possible. When lying down, put a knee wedge pillow under your legs to elevate them above your heart. Avoid too much salt in your diet. Talk to a vascular doctor as soon as possible and let them sort it out for you. Hope this helps Take care