Aquaphor Baby Healing Ointment
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.

When skin is raw enough that it's oozing or torn, this one is built to dry out that light exudate while a semi-breathable barrier keeps stimuli off the exposed area. The menthol also cools and calms inflamed tissue, so it is doing more than just sitting on top of the rash.
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Raw, torn, or weepy diaper rash and skin breakdown
It contains menthol, which cools on contact, so it may feel different than a plain barrier ointment your baby is used to.
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