very painful for me but works
Make sure you patch test this before you try it. You could be allergic to this and I see people on this page who have experienced rashes from it and I wanted to make sure people know that isn't normal and is just an allergic reaction (probably to the cinnamon).
Also, this is VERY PAINFUL for me. I see people who don't find this painful at all and I'm not sure if that depends on the amount of acne you have or how sensitive your skin is, but as someone who has a lot of acne /and/ sensitive skin, this burns so much for the first few minutes that I have to pinch my thigh to distract myself and get thru putting it on my whole face. After the first 4-5 minutes, it stops burning as much and just throbs for the next 10 minutes or so. After that, it doesn't hurt at all and just gets stiff. I leave it on for a few hours, but as long as you aren't allergic to this I think you can leave it on for as long as you'd like.
If you have a low pain tolerance and this does hurt you, I would recommend only using this as a last resort. I consider myself to be someone with a very high pain tolerance and I still cry when I put this on.
Note that the more cinnamon you add the more painful it will be.
As far as results, I've used every other DIY I have been able to find on the internet and this is the first one that has done anything for me. I'm on my 4th day of using it and while my acne is still looking pretty bad, it's been a lot less red and the older acne scars are significantly less noticeable. I also haven't been getting any new pimples in the places where I've been applying the mixture.
I highly recommend this mask, but only if it's not painful or if you have nothing left to try.