So you made a mistake. You cut the ground from under your own feet. You stirred up the hornet's nest. You barked up the wrong tree. Ok, that's the last idiom, I promise. But you did do something with your site that Google did not approve of, and now you are paying the consequences. You may feel like covering it up, pretending it never happened, or you may feel like you were simply trying to be as successful as possible, so you are not ashamed.
Guess what? In Google's eyes, the why doesn't matter.
They slapped your hand as it was in the cookie jar, and now your website is paying the price. There is a whole slew of reasons as to why Google may penalize your site. You can do a simple search to find out what some of them are. What we are talking about today, is how to recover.