Pinky McLadybits via Lainey
You know those thin face blotter papers that cost a bunch of money for a little envelope of them? Toilet seat covers do the EXACT same thing. So, you can grab a few of those and cut them up & keep them with you to blot your face when it's getting greasy/shiny, or if you're super classy like Lainey, just pull one out of the package and use it as-is.
You can also use tissue paper, like the kind used for gift bags, or Kleenex to blot the oil from your face.