90 year old male with swollen and red leg has undergone multiple tests for heart function and infection including removing a swollen lymph node for biopsy. Two separate Ultra-sound tests did not find any blood clots other than one chronic blood clot that is in his groin area on the leg. It is not being removed because of the risk involved. Patient is diabetic but the condition is under control with excellent blood sugar levels. He has no pain or discomfort other than episodes of a burning sensation on the skin of his left leg. Both legs were originally swollen and the skin redness covered both legs up to his navel. The right leg has returned to normal with no swelling or redness. All tests indicate everything is normal. Medical staff is stymied as to the cause of the problem. Individual has orthopedic leg wraps on but had been experiencing a burning sensation on the skin of the leg. Do you have any ideas what could possibly cause this problem?