my son is 18 years old with downs syndrome. I have taken him to primary physician, and his heat doctor yet his left leg is swollen seems all up his thigh. it is darker from just below his calf to ankle then outer portion of foot. there is a hardness above ankle but just below calf, doesnt go all the way to ankle. at one time I think it was causing him discomfort but now he says nothing and that it doesn t hurt. He walks fine, runs etc with no obvious pain or limping. The cardiologist says no DVT heart fine, What should I do now, especially since the swelling is persistent?