Stinging pain in right shoulder above right arm pit what could cause this sometimes it makes my neck and arm hurt?

Shoulder pain: Shoulder pain common causes and presentations are many but most frequent are soft tissue injury. Like a muscle sprain or even a rotator cuff injury . These injuries can cause pain in the shoulder which could radiate down the arm or to the neck. Other causes could be radiating injury from the neck. Either way you need to see a doctor to further evaluate your problem . Rest the shoulder for now :)