Charcoal is good for drawing. That's why the Amish use it as a drawing salve to draw out toxins. If you use it on your face, there is a chance that you will get some acne like lesions as it has drawn out toxins to the surface.

They're good for absorbing excess oil

charcoal water filters work really well getting chemicals out of the water. 😺

make sure you light it in the corner