Bruising and swelling is completely normal after vaser lipo. Make sure the compression garment is in the correct position. It is better to be tight than loose. Do not take it off unless your surgeon makes this call. A complication that you should be cautious of is getting a blood clot in the leg, also known as deep vein thrombosis. The compression garments should help with preventing this, as well as walking. If you notice signs of infection in your knees, swelling, redness, pain, abscess, fevers, then you should notify your doctor urgently.