Move to a cool, quiet place
Remove tight clothing
Take slow, deep breaths
Drink water
Wash your skin with cool water
Apply a cool compress
Use a gentle, fragrance-free moisturizer
Avoid scratching
Check for new soaps, detergents, lotions, or foods that may trigger it
Avoid caffeine, alcohol, and nicotine
Rest and reduce stress
Take an antihistamine if you normally use one and it is safe for you
Seek medical care if it is severe, persistent, or comes with rash, swelling, trouble breathing, fever, or confusion