system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:What exactly is an abscess, and when/why does it need to be drained?

Here's what I think I know about abscesses and their formation:

1. Some pathogen gets into the body

2. Immune cells recognize it and start secreting substances like Histamine to bring more blood flow to the area and increase vascular permeability so that neutrophils and other things can get to the area

3. The neutrophils eat up the bacteria

4. The neutrophils then apoptose (and the collection of these dead neutrophils is called "pus")

5. An abscess is just a red, tender, warm area where pus has built up?

6. And it has to be drained I'm not sure when/why...?
gpt
Yes. Basically pus are dead cells. The body makes a capsule to isolate it from healthy cells. You must drain it as fast as possible cause if your immunity can't deal with it anymore, the bacteria can enter the bloodstream and cause a Systemic Inflammatory Response Syndrome then if it's untreated goes into sepsis with septic shock and death.

There is a famous latin quote in medicine that all surgeon know "Ubi pus, ibi evacua" that means  "where is pus, you must evacuate"