Benzoic acid (6%), Salicylic acid (2.5%), Precipitated sulfur (4.6%).
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Pros:
This is the only thing actually works on cystic acnes. The next best thing would be the Buffering Lotion from Mario Badescu which works much slower. It doesn't erase the big pimple overnight but makes it significantly smaller, flatter and less red and sore. The smell is ok, the tingling is bearable(just think about the psychological and physical pain caused by your pimple!). It comes off easily but I only use it at night, the only trouble is having to wash sheets and covers more often!