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It's mostly so the product doesn't mold over. Skincare products are excellent mold cultivation medium: they're stored at ambient temperature (or more), they provide moisture (and are stored in moisture-rich environments) and they're full of interesting nutrients.

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Plus most people would ‘double dip’ when using jars so there will be a transfer from the skin into the cream in the pot. If you have a pot which lasts a couple of months that is potentially quite a lot of material transferred from your skin into the dish.

> Plus most people would ‘double dip’ when using jars so there will be a transfer from the skin into the cream in the pot.

As long as the packaging is not single-use or a bottle / tube they're multi-dipping anyway.

And most containers are either completely open or will get filled back with unfiltered air.

That's a good point.

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