You can file a follow-up application if you have received a negative notice in your initial asylum procedure. If your asylum application had been rejected in a safe third country or in Norway or Switzerland, Germany is responsible for your procedure. In this case, it is referred to a second application.
This is possible, if you were placed in danger should you be returned to your country of origin or if the circumstances in your country of origin had deteriorated. If BAMF accepts your evidence, you undergo the whole asylum procedure again.