Delusory Parasitosis:
Some people are so paranoid about bugs on their bodies that they become psychotic. In an obsessive-compulsive disorder gone haywire, these people imagine that they are constantly under attack from invisible bugs. In their panic, sufferers often scrub their skin raw and scratch themselves bloody. They toxify their homes with pesticides, bathe in caustic agents that destroy the skin, and often commit suicide.

Few things are more terrifying than this....
Necrotizing Fasciitis is one.
Stevens-Johnson Syndrome is another.

There are so many awful things that can happen to our bodies and/or minds at any time. For any reason (or no reason at all.) It's frightening. Above all else, I hate skin maladies. Ugh. I will choose pain every time over the agony and horror of itching.