eli5:why do inside pimples occupy such a huge area?

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I have an inside pimple right now, I took a needle and popped it and some of that white fluid came out. Yet the area is still very tight, like it it were a wad of muscles squeezing together and balled up. Of course I’ve had a thousand of these it’s not my first time. But what I’m confused about is how come the area is so much larger than the actual fluid that comes out. And why does it stay bunched up for a day even after you pull out the fluid?

EDIT: everyone can rest easy my ingrown hair has been expelled from my body.

Edit2: I never asked for medical advice on what to do with my pimple.

Edit3: an inside pimple can be a called a postule or a papule. If you don’t know just Google it.

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