ouch, apply some baking powder to it. "Mix 1/4 of a cup of aluminum-free baking soda with 1 to 2 teaspoons of water together, and then apply the paste to the area that was stung. Reapply every 15 minutes or so. It's believed that baking soda can help neutralize the acidity of the sting and mitigate inflammation."
"Baking soda is a great way to help neutralize the venom of a bee sting. All you need to do is create a thick paste out of baking soda and water and apply it to the sting." What do you after a bee sting