What is the ruling on the sticky liquid that comes out of pimples on the face when they are squeezed?

What flows from pimples due to squeezing is considered impure if it is not a small amount, whether it is pus or other matter. However, what comes out on its own without any human action is excused, and there is no need to wash it. This includes what flows from wounds, burns, or blisters that appear on a person's body during hot days.