Shaving Mistakes That Trigger Underarm Dermatitis—and How to Fix Them

A beauty editor develops severe underarm dermatitis after using an old razor and expired deodorant; a dermatologist explains irritant versus allergic dermatitis and common triggers in deodorants, then outlines treatment: pause shaving and deodorant, use a topical steroid and fragrance-free moisturizer to rebuild the skin barrier, and opt for gentler products. Recovery can take months and may leave discoloration, with tips including using fresh razors, patch-testing for Allergies, and checking deodorant ingredients (aluminum vs natural) that can affect irritation.