Well, I am sure you have heard this before but using diuretics would be a good way to flush fluid and salts out of your system. Also, elevating the area could help (but mostly used for lower extremities).
Another course of action would be combination of techniques: manual lymph drainage, compressive bandaging, compression garments, pumps and physical therapy.
I assume this is caused by an infection or injury...correct?
Why aren't the docs making any progress? What is the prognosis?