The trick to this mask is patch testing it, DO NOT PUT ON YOUR WHOLE FACE if you've never tried it before. You want to make sure that you put a small amount on your cheek FIRST because everyone's skin reacts differently.
Another thing is that cinnamon will burn on any skin at first, it takes about 10 minutes for the burning sensation to go away, your skin will get red under the mask but it will go away eventually revealing soft skin.
Lastly, this actually works. I have mild acne + acne scars + sensitive skin that breaks out from just breathing.... I used it for the first time last night. I saw some of the acne bumps had already gotten smaller and my skin is not red.
I mixed half tablespoon of ground cinnamon and squeezed lemon juice enough to make a paste. I left it on overnight as a spot treatment on the affected areas.
You have to be careful when trying new products on your skin, always patch test and most importantly, BE PATIENT :)