Pus

One of the most unpleasant compounds produced by the human body is likely pus. It is thick and occasionally has a terrible scent. Additionally, it's a great sign of a severe infection. However, it's your body's reaction to an infection, not the sickness itself. As uncomfortable as it may be, you would probably be in a lot of pain if you couldn't create pus.

Pus accumulates around an infection when you have one. White blood cells are the only ones trying to get rid of the virus. When the illness is more severe than your immune system can handle, issues develop. For instance, white blood cells can't really eliminate a foreign body, which causes an infection to spread.

Similarly, as tissue dies and the infection spreads farther than your immune system can handle it, an abscess may only get worse. However, keep in mind that if you couldn't create pus, your body wouldn't have a first line of defense against infection, and even a minor skin infection might potentially turn fatal.