acne
"I have "backne," and this product works pretty good at keeping it from flaring up. My dermatologist recommended it over products such as Differin since it's so easy to spread -- even if you have hair back there. I don't notice any dryness or stomach problems. It does burn the first couple of times you use it, but that goes away. If you apply it to your back, make sure you also get some kind of tool to reach back there (unless you're lucky enough to have a significant other that will apply it for you). My dermatologist gave me a long stick with a pad on it.

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