Remove the Stinger
While many wasps may retain their stinger after stinging their victim, some may end up leaving the stinger in. Prior to applying any ointment to the wasp sting, the stinger from the wasp must first be removed. To do this, scrape with your fingernail or a stiff object like a credit card. Never use tweezers or try to squeeze the stinger out as the venom sac could still be attached which would release more venom into the wound.
One of the worst aspects of a wasp sting is the initial pain and stinging sensation that comes along with the wound. A great way to ease the stinging sensation of the wound would be to apply vinegar to the sting mark. To do this, dip a cotton ball in vinegar and then apply it to the wound. The stinging should ease immediately after the vinegar is applied. If the stinging sensation returns, reapplying vinegar should help.
After the pain of the wasp sting has been reduced or relieved, the next step in healing the sting is to reduce the swelling that comes naturally after the sting. The best way to reduce swelling would be to apply ice or a cold pack directly on top of the wound. By applying the cold compression to the wound for 10 to 15 minutes, swelling should decrease significantly. Also, taking ibuprofen directly after being stung could reduce both the swelling and pain associated with the wasp sting.