Clean lukewarm water, or cold water if the swelling is bad is what i would use. They recover very quickly normally, unless infection gets in of course. Our little chick had no ear and it all re-grew albeit a bit misshapen.
Best of luck Minty. I'm off now to check on Daisy, a leghorn bantam that was egg bound this morning. The egg burst and I managed to retrieve all the shell but she still seems a bit droopy.