I am a teenage girl who has suffered from acne for 5 years (12-17) - I felt like I had tried nearly everything and started to get desperate about clearing my worsening facial, chest and back acne. Finally I tried this stuff and I made the mistake of applying every night for the first week and the more sensitive skin (neck and face) went bright red and felt like it was on fire. As well as this, my skin was so incredibly itchy that I had to excuse myself from class just to get an ice pack to cool down my back. But god was it worth it. About three weeks in and my skin is so silky smooth and nearly completely clear. The only thing I can say is that my skin is still super sensitive to sweat and water but honestly, for me, it is totally worth it.