Shoulder bursitis is inflammation of a bursa while in the shoulder, typically the subacromial bursa that lies amongst the acromion – the bony idea at the highest of the scapula, or shoulder blade as well as supraspinatus tendon from the rotator cuff). The ball is 3x the scale on the socket. https://www.theorthopaedicandpainpractice.com/what-are-some-shoulder-pain-treatments/