Putting ice on it will reduce the redness and swelling. It will disappear on its own in a day or two.
You can buy bite be gone ointment that will dull the pain and reduce the swelling at almost any pharmacy. Anything that has an antihistamine will aid it and allow it to heal much faster.
that is SO wrong what you do is put Haulieri lotion on it and then poke it 100 times or stab it with your finger nail 50 times and it will feel a WHOLE lot better than the answers before this one!