I am sorry you are having trouble with this. I had to read your post a couple times to really grasp it. The lymph node under your collar bone is the ones my doctor is always feeling.
There is a thread that I think you might be interested in;
https://connect.mayoclinic.org/discussion/lymphedema/
I am very curious about you might go about treating this. Have you talked to your doctor about this, just to make sure there isn’t another reason for this?

I saw my oncologist who recommended a physical therapist. There is no one LANA certified within 120 miles of me. She helped a little, and if there is nothing new I will do the exercises she recommended.

Since this is not a limb, compression is not an option.

Just wondered if there is anything new...

I have never seen a women's compression shirt that covers the shoulder blades. There are some mastectomy vests that partially cover the shoulder blade but the unneeded compression on the chest is uncomfortable.

I don't have a lot of swelling (yet), trying to keep it that way. I was just wondering if there is something new in treatment of lymphedema.

@chrisbomstad I had lymphedema briefly during chemo for breast cancer in my legs and feet. I had switched to a plant-based diet during chemo and discovered that several of the vegetables I was eating in large quantities were loaded with sodium. Celery has the highest sodium along with spinach & beets. I also quit walking as much as I had been because I thought it was aggravating it. Wrong! I started walking at least 3 miles a day and watching my salt intake, drinking lots of water and it went away. I hope this helps!

Anyone experienced Lymphedema rask/bumps on neck?