This is a common condition that is most prevalent in your 60s and over. If you observe the condition you may need to see your health provider for investigation and treatment.
Swelling can occur in one leg and foot, or both. If one limb is involved the cause is local in the leg itself, such as lymphatic gland blockage near the groin, blood vessel blockage due to deep vein thrombosis (DVT), skin infections, cellulitis and so on.
Enjoy watching the you tube.
Dr Harold Gunatillake