I had a lumpectomy 5 weeks ago and only just realised that I have cording under my arm. It's painful to lift my arm above my head and I see a cord bulging out from under my arm that is sore to touch. ...
I have cording return even years later but with raising arm exercises and lots and lots (meaning several times a day) of patting and massage right from the wrist all the way back up the arm and across the collar bone I can usually get it right in a couple of days myself.