I had a cortisone shot and am having bruising below the injection. Is this normal?

Hi Bren707,
Yes, it is common to have some minor bruising when you have knee injections. The Dr. has to go through the layer of skin and then into the joint capsule to inject the steroid medication. A small amount of bruising is normal and gravity could pull the small amount of blood lower than the injection point. Your Dr. May have hit a small blood vessel during the procedure.
Hope this helps.
Kind regards!
Jinx