Still flushed in face after four days from cortisone shot in shoulder. how long might this last?

See answer: Faciak flushing is a common side effect of steroids. This reaction is more common in women and is seen into up to 40% percent of patients. This can begin within a few hours of the injection and generally lasts only for a few days and on occasion longer depending how long the steroid remains in your system. No specific treatment is warranted.

"Steroid flush": The cortisone shot is used for pain control and reduce the inflammation. It is not unusual to experience redness and a feeling of warmth of the chest and face after receiving a cortisone shot. The "steroid flush" can last up to one week.