Eli5: White sticky thing at the corner of your lips

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I always wonder what’s the white sticky thing that appears at the corners between your lips when you wear a mask for a long time

In: Other

It’s a combination of dried saliva, mucus and dead skills cells. It’s very common and nothing to worry about. AFAIK there is no scientific name for it and whilst we know what it is, and that is can be associated with dehydration the exact cause of it is still unknown.