Go to the a healthfood store and buy some oatmeal bath. Not the kind you eat...ask specifically for 'oatmeal bath' or something to make an 'oatmeal mask'. Follow the instructions and use that on your face. At the very least, it should reduce any feelings of itchyness. Best case scenario, it will also help to bring down the swelling.

Again...don't try to do this with a package of Qauker Oats, that won't work.