I am not a dermatologist so can’t go into specifics, but it pretty much depends on the type of pus. If it is more liquid, it has more water content. Pimple is a [comedo](https://en.wikipedia.org/wiki/Comedo), pus is a [exudate](https://en.wikipedia.org/wiki/Exudate) and cyst is an [abcess](https://en.wikipedia.org/wiki/Abscess)
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