Elsa bump on her side hip

Elsa got a reaction from her rabies shot last week and our vet saw her on Monday. Said it's common sometimes for puppies to react to shots a week later. She has a slight bump on her hip. Our vet got a sample of it and it was nothing to be concerned. Our vet said about 10 days it should be gone.  It has gone down some since this picture was taken.
Anyone else ever have this happen?

Can't really say about the rabies vaccine, as we don't automatically get it in the UK (unless we need to get a pet passport). 

But it's not unknown for any vaccine to produce a reaction days (of even weeks) after it's administered. I take it the original jab was in that spot?