Suggest Treatment For Swelling On Leg And Soreness On The Knee And Thigh

I am concerned that that my left leg is swelling up all of a sudden. It is very sore and from the knee cap to the thigh. My right leg is just fine. I m concerned about blood clot. Very tough to walk. I don t have family history of blood clotting. I have gout and had a bad attack. I have never had this happen before. Dan McEnry