Hello. Stung by a wasp need to take some measures to reduce the harm produced by the toxin.

Guidance:

Horse wasp venom is a weak alkaline substance, you can use vinegar to wipe the local area, and use ice on the stings and bites, can reduce pain and swelling. If the pain is severe you can take some pain medication. Or put a piece of garlic, pull out the skin, crush it, put the juice with the meat, put it on the wasp's sting, use it several times, it can be cured. I wish you a speedy recovery!