With anything, there is a line.  Even with the best treatments of any kind, you can quite easily go overboard, and then you are obviously not helping anyone, especially not yourself.  For example, over-washing can cause your skin to go into overdrive and produce more oils, or it can just react by getting dried out and damaged in general, and then you have redness, peeling, and other unpleasant symptoms of that particular problem.  Either way, it really doesn’t help your skin, as over scrubbing likewise does not help your skin.  It can strip away more layers to actually be harmful.  The third most prevalent mistake is using the wrong product, and yes, using benzoyl peroxide is always the wrong product in general.  If it can damage your skin, especially with sensitive skin, it is literally always the wrong product.  Likewise, using the wrong makeup is a big mistake.  The wrong makeup can damage your skin, it can cause clogged pores, it’s not a pretty subject in general.  All of these things can be the biggest mistakes you could make for your skin, and they can cause greater acne along with more long term problems and damage.  So it’s important to choose the right things.