If you have been stung by a wasp, there are several things you can do to alleviate the pain and swelling. Here are some tips from the search results:

At-Home Treatment:

• Wash the affected area with warm soap and water to remove any bacteria or venom the wasp might have carried.
• Apply a cold pack wrapped in a thin cloth to the sting site for 30 to 60 minutes, in intervals of 10 minutes on and off. This will help reduce the swelling and pain of the wasp sting.
• Take an anti-inflammatory medicine like ibuprofen to reduce the swelling and pain of the wasp sting.
• Apply an antihistamine, corticosteroid, or calamine cream to the entire red and swollen area to relieve the itchiness and pain of the wasp sting.

When to Seek Medical Attention:

• If you have been stung in the mouth, nose, or throat, you should seek medical attention immediately.
• If you have an allergy to wasp, bee, hornet, or yellow jacket stings, always carry a bee sting kit and know how to use it. These kits require a prescription.
• If you have a large local reaction after a wasp sting, let your doctor know. They may direct you to take an over-the-counter antihistamine medication to reduce your discomfort.
• Severe allergic reactions to wasp stings require immediate medical attention.

Remember, prevention is key. To reduce the possibility of insect stings while outdoors, try to avoid using perfumes, hair products, and other scented items, brightly colored clothing, and going outside barefoot. Use insect repellent, and avoid locations where hives and nests are present. If an insect comes near, stay calm and walk away slowly. If you have a known or suspected allergy to stings, carry a bee sting kit at all times and know how to use it.