My grandmother had her lymph nodes removed along with her mastectomy and has developed Post Mastectomy Lymphedema. Her left arm is extremely swollen with fluids. She was told to massage it and try to keep it elevated. I have been searching for "natural" ways to help her with this. I know that grapefruit oil is supposed to help with the fluid buildup and I saw this forum saying that castor oil helped with swollen lymph nodes. I was wondering if castor oil could be used as a carrier oil. Would this help with her drainage like it does for the swollen lymph nodes??? Also are there blends that are more effective than grapefruit oil alone? If so what are the amounts that should be used?