system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why is your nose and forehead (generally) a lot more OILIER than other parts of your body?
gpt
Two reasons. 

1. It's where we keep our stuff. A chapped face means you can't effectively see, eat, breathe, whatever. The sebaceous oils help provide a bit of protection against the elements. 

2. As we're social animals, our faces require more lubrication to do all the subtle facial gestures we do to convey emotion. By having more sebaceous glands in the 'T-zone', it can (via gravity) keep our whole face flexible.