A lot of pimples (and many cysts) aren’t excreting *pus*, but rather skin cells that have become trapped in the pore. If there wasn’t any inflammation, it’s probably just skin cells and oil.
There’s a growing theory that inflammatory acne may be caused as much by hormones as bacteria; *c. acnes* and other bacteria are present in most pores, but most don’t become inflamed. UV exposure is also a likely contributor.
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