Don't lean forward. Change chair/table etc as said above, if fixing posture isn't enough. I had the same thing and along with posture fix, exercise to keep that area's muscles "awake" so they didn't slump the way bad posture encourages in the first place, that helped too. Stuff like this really helped to keep a good posture without needing to consciously check myself.
And then stretch. When done right it felt like ironing out all the kinks from bad posture's tense muscles.
And/or have someone massage that spot and everything around it. But first of all fix bad posture. Don't lean forward and don't weigh on wrists or shoulders.