i guess, it is bursitis ( becos of the location ) it is usually due to chronic, repetitive injury, than an acute one ex. student's elbow
Should have differentials, certainly looks like olecranon bursitis, but why isn't it: - Rheumatoid nodules - Subcutaneous abscess - Gout was mentioned etc
First diagnosis is olecranon bursitis .Correlation with clinical and ultrasound findings is necessary.