What Causes Pain In The Shoulders And Numbness In The Arms?
Cervical and shoulder conditions to consider.
Detailed Answer:
Hello and thanks for using HCM.
I have read your question and understand your concerns.
It is unlikely that the cyst after i.v. injection is causing your shoulder pain and arm numbness.
In my opinion, cervical spine conditions such degerative discs and spine disease, shoulder grip conditions ( rotator cuff, bursitis ), should be considered and evaluated further as possible conditions that may cause symptoms similar to yours.
Get evaluated first by your primary care Doctor, and probably by imaging of cervical spine and shoulder in order to get a correct diagnosis of your condition.
In mean time, since medications aren't working, putting your arm and shoulder at rest, avoiding physical activity for few days is necessary.
Hope you found the answer helpful.
Kind regards.