Left banner image adapted from amyloidosis gross node, by Ed Uthman MD, Creative Commons license


People are fascinated with things that ooze. The video below the fold is at the top of search results for "gross". Pimples, boils, cysts - they all entertain because of how they seem to have some unending supply of something we don't recognize as body fluid. What they leak is pus. Keep reading to find out what this liquid is.

What is it? Pus is a body fluid created by an immune reaction. Inside the tissues are specialized cells that engulf debris, like dead cells and foreign material. Anything deemed potentially dangerous, i.e. foreign, is attacked by white blood cells (aka immune cells) to neutralize the threat. The result is a milieu of dead cells and debris, white blood cells, blood, tissue fluid, and if it's due to an infection - pathogen. The fluid then tries to make its way out of the body, forming a boil on the skin.

Fancy term for this: Abscess

And now the video -

Top 10 Zit Popping - Gross by DaVids63

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