Charcoal has the ability to absorb dirt, toxins and other micro-particles from the skin, basically cleansing your skin from impurities and fight acne.
It is suitable for those who have acne-prone skin to prevent massive acne breakouts. Using charcoal ingredients for sheet masks is common in the beauty market as it could absorb multiple times of its own amount of impurities. And most importantly, it won't be absorbed by our skin.