Is it normal for eyes to swell shut after a concussion?

It's not uncommon and it makes sense. The concussion itself doesn't cause this. However, if you're talking concussion, you're talking about a pretty serious impact. If there's discoloration and signs of bruising around the eyes, I would be inclined to consider this a standard impact injury, e.g. bruising, and call it a collateral injury. If however, you agree that this is a bruising effect (and perhaps if you call your doc and get her to agree too), icepack it. However, if you're concerned, call whoever treated this patient and ask them. It's hard to really know when I can't even see the injury :}