Hi and welcome

I am wondering as others have stated that you may have swelling in the area causing the pain. It may also be other factors.....lymph may be an issue....an assessment from your massage therapist if you have one may help with this matter before you see your doctor. MT's are great as they will tell you if it is muscle or fluid or what the feel in the area. I trust my MT so much as she knows my body better than anyone.

It could also be new muscles that are taking over for ones that have been removed.....not sure if you had scalenes removed or not......you did not say in your first note......you may have pulled something moving in a different way...are you getting PT???? did something happen there????
lots of questions.......

hope some of this is helpful!
take care,
Victoria