I adviced you to go to a doctor have a radiographic examination on the shoulder better if its an Wikipedia reference-linkMRI and see how it goes from there for the mean time if it is within the 3 days of injury kindly apply a ice massage do this until the part that you are massaging is numbed do it 2x a day for 15 minutes. It is outside the 3day period you can do hot compress for 15 minutes on the affected shoulder. Let us know whats your progression.