How to address swelling

What strategies have you found to be most effective in addressing water retention in the legs? My husband’s right leg is taunt to the touch. He’s also develop a” bubble “ on his right side between the bottom of his hips and the top of his hip. The site is also tight feeling.

No pain. Just feels tight.

Pressure socks. Foot elevated.

Still an issue.

He’s on TPN and hydration, and needs those to keep his kidneys working. No clots.

Drs unsure what to do so have done nothing.

There is pressure on his vena cava which is adding to the situation.

Please share what you do to address this.