Four days ago I noticed a sore spot above my right ankle. Now sight of trauma. Some swelling. Not bruised, not itchy, no foot pain or bone pain. Next day back of calf ached, considerable more swelling but still no change in skin color. Now, pain on back of leg from under buttocks down to heel. Hurts to walk, and in sitting position. No fever, no sickness. Blood pressure and sugar levels fine. What might be the cause? X-Rays are scheduled in a couple days.