think of it this way: that pimple was a pore that was secreting oils until some dried oil and skin cells and sometimes bacteria caused it to clog. the clog caused the pore to swell like a tiny blocked hose which causes irritation to surrounding tissue. so, squeezing that pouch, if you are really lucky, pops the dried cap of oil and skin cells and returns the pore to normal functioning and excreting. often though, you injure the delicate tissue of that pore and surrounding skin and potentially create a perfect opportunity for infection. that infection can further aggravate the injured skin, causing scarring.
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