Instruct: Classify a review into positive or negative sentiment.
Query: best acne treatment I know

I just have got one question: Why can't you find this product anymore on the shelves of a drugstore? I looked for it everywhere, but I couldn't find it, so I was very happy to discover it at amazon. It's the best working product I've ever tried (and I've tried many!), it makes these painful, ugly acne spots get much less painful and red in just one day without drying out the skin too much. For me, it works just perfect!