I've been using this mask for a while now and so far I've been quite happy with it. I use it once a week as an exfoliating/cooling mask to help draw out the excess sebum that I acquire throughout the week. After using this mask my face feels very fresh and cool and I have not experienced any irritation from this product all. Sometimes I only use it on my nose if I want to get rid of my extra whiteheads. On days when I start breaking out in certain spots, I dab a little over the forming pimple then I leave it on. The pimple is a lot more calm the next morning so I think this is perfect if you catch a pimple in its early stages. I can't say anything for more bigger/developed acne as I have not experienced that for quite a while now. If you're using this as a mask I think 10-15 mins is a good time to leave it on, or at least until you feel the mask drying and you feel a tightening feeling. This has been my go-to weekly mask for a while now and has satisfied me every time.