Dx'd with shoulder strain. ordered naproxen 375mg. severe left arm pain radiating into back cont esp @ night. chills, red splotches on left arm before starting naproxen. what is this?

See details: It is difficult to give specific advice without being able to visualize the shoulder. The one thing i can say is this does not sound like a strain. You need an orthopedic evaluation if you have not had one already. Given the severity of the problem a more thorough evaluation is essential and an MRI should be seriously considered.

See a doctor: Cannot possibly diagnose this without a full history and physical exam . Good luck.