This thesis deals with the effects of facial tattoos and facial painting on the different processing steps of facial recognition systems. For this purpose, a database of image pairs was created, each of which represents an individual with and without facial tattoo or painting. The database was categorized and then subjected to face detection and quality assessment. In addition, the image pairs were compared and the recognition performance was calculated. The evaluated results showed that facial tattoos and paintings have measurable negative effects on all processing steps investigated. Furthermore, it can be seen that the effects deteriorate with the size of the tattoos or paintings.