P.M.
As long as the itching/burning is localized, just wait it out. You don't need a doctor to tell you to just wait and it will go away. But if you are breaking out in hives or any severe itching or swelling anywhere else on your body, especially you lips, mouth, tongue or throat, get to a doctor immediately.
For a local reaction, you might get relief from a paste of either papaya- or pineapple-based meat tenderize, or baking soda. Cortisone cream may help. A homeopathic cream called Sting-Stop (from health food stores) is very effective for me.