A swollen leg is described medically as edematous. This is due to fluid retention. The higher up you retain fluid, the worse the situation. I suspect the dent that you noticed in your thigh is due to excess fluid there. Blood clots are notorious for causing fluid retention. So is heart failure. Pulmonary hypertension & kidney failure can do this, too. However, heart, lung & kidney problems leading to fluid retention typically do so in both legs equally. Perhaps you have a clot (or something compressing a major vein) higher up in the thigh or pelvis region leading to one-sided swelling. Whatever the cause, you need to get evaluated immediately. Good luck!
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