system
Given the following post, respond as if you're commenting on Reddit:
human
Is it true that stress causes acne? And if so how and why? 

I've always wondered if "stress acne" is caused by an increase in oil production due to stress or if it is as simple as the human neurotics of touching your face during a stressful situation (or picking your zits) causes breakouts when you are stressed out.  If a typical zit is due to a clogged pore then how do you get more than normal clogged pores during stress? Is it a hormonal thing? etc, etc?
gpt
When the body gets stressed it starts to synthesize corticosteroids from the adrenal cortex.  The main stress hormone is cortisol which enters the blood stream, downregulates your immune response and can exacerbate acne.