system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How can we sleep at night without any pimples and wake up with a big one? how do pimples grow overnight?
gpt
If you look really close, we humans are covered in billions of little holes that leak all kinds of liquid, all deliberately though, our skin likes covering itself in oil and sweat, even if we think it's icky.

While we are awake we sometimes feel that ick, and do something about it like wiping or washing. While we are asleep we just throw our face at a pillow and lie there for a while, so any ick that wants to come out sometimes can't because the pillow is in the way. Sometimes that seals the hole that the ick was trying to escape through, making it worse. No big deal, our skin can puff up and carry this excess ick till there's another way to get rid of it. 'Popping a zit' is basically forcing a brand new hole in your face for the ick to escape from, which is super icky and actually damages our skin, but our skin is amazing and grows a new layer, pushing that old and punctured layer off.

Most dust and dirt in a home is human skin falling off the very surface of us. Sounds scary, but all part of the plan :)