Ah thanks, I searched for lymph node massage on youtube and applied the technique. There seemed to be a small squishy lump which when I manipulated like in the video seemed to 'pop' downwards. An hour later I can't feel the lump at all.

Btw, another symptom of my TOS is that if I stand and keep my arms dangling by my sides they become discoloured, below is a photo of my right arm after about 40 seconds of it dangling. It also happens in my left hand but not as much.