Desitin Maximum Strength Paste
40% zinc oxide — the strongest you can buy without a prescription — in a paste thick enough to stay put for up to 12 hours. Visibly calms a raw rash overnight.

A barrier ointment thin enough to use at every single change, which is what actually prevents rash. Also fixes cracked knuckles, dry cheeks and your own hands.
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Prevention, and the one tube you keep everywhere
A petrolatum barrier, not a zinc treatment — once a rash is angry you want zinc on top of it.
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