A week ago to-day I was stung by a wasp. I immediately put vinegar on the spot ( I had just recently read to do this) and I took a 24 hour antihistamine. The stinging left immediately, however I still have a red sensitive area a little bigger in size than a quarter. It is a bit itchy and annoying. I would have thought this would have been gone in a few hours. It seems to me that a week is a long time. Do any of you have any suggestions?