Some ingredients in shampoos, like sulfates, and some medicines, like lithium or malaria drugs, can be irritating.
Also, different people report problems when they:
-- Live in a dry climate. (It helps to moisturize.)
-- Get sunburned. (Seek shade, wear a hat, and use sunscreen.)
-- Blow-dry their hair. (Air dry or gently towel dry instead.)
Other ways to avoid flares? Don’t smoke, and pass on alcohol.