Hello, thanks for using HCM.
From what you described, its most probable that you are suffering from a poor venous drainage due to a disease known as deep venous thrombosis
. Being over weight and the history of knee replacement
surgery are important contributing factors to the disease. You need to see your doctor for re-evaluation and to do a Doppler ultrasound and D-dimer tests to rule out or confirm the diagnosis. If the diagnosis is confirmed, you will require anticoagulants. Other possible diagnosis include cellulitis, muscle injury, lymph obstruction, venous insufficiency
, popliteal cyst