The pain caused by a wasp sting can be relieved with over-the-counter pain relievers such as ibuprofen and acetaminophen, according to WebMD. An antihistamine product taken by mouth or calamine lotion applied topically to the affected area relieves itchiness.
Ice applied to the affected area controls swelling following a sting, notes WebMD. For stings on the arms or legs, elevating the affected limb also helps. It is important to remove the stinger from the area as soon as possible. Use tweezers or scrape the stinger away with a fingernail, being careful to avoid pinching the stinger, since this can inject more venom into the wound.