Treatments that work
Ice - A great way to reduce swelling and redness from a wasp sting by slowing down the blood flow near the sting. Wrap a few ice cubes or an ice pack in a towel and place it on the affected area. Leave it for about 15 to 20 minutes and apply an antihistamine cream after.
Cucumber - Fresh cucumber slices can also cool the area and provide you with temporary relief.
Hot water - Run the affected area under water as hot as you can handle for a few seconds. Studies have shown that this helps to reduce swelling, itching and pain.
Antihistamine - Products containing antihistamine relieve itching and ease swelling. You can either use creams for local application or take it in the form of pills. Make sure to consult your GP beforehand and read the product labels carefully.
Menthol - With its cooling qualities, menthol and products containing it are a great anti-itch treatment. Apply it to relieve the symptoms of wasp stings.
Painkillers - You can take paracetamol or ibuprofen to ease the pain, though since stings are generally not that painful, you’ll likely won’t need to.
https://www.fantasticpestcontrol.co.uk/wasps/wasp-sting-treatments/