I bought this stuff, used it, was satisfied and decided to take a little adventure and see what kind of reviews it actually has received.
This was the first review I came across:
http://www.epinions.com/content_97460522628
Now, this customer went so far and aded the actual instructions in her review. In my experience, and in my own mind, most products that will alter the color of anything on your body usually suggest doing a "small test area" (even if it is not suggested, I would hope one would automatically consider it)
I guess Neutrogena should change their instructions a bit to conform to those who lack basic common sense.
Her review was entertaing though.