Abstract: The present application relates to a system for treating a part of a body to be treated. In particular, the present invention relates to a system for cutting hair on a part of a body to be treated. The system has a hand-held treating device (20) having a treating unit (24). The system also has an imaging module (30) configured to generate information indicative of the position of the treating device (20) relative to the part of the body to be treated based on an image of a part of the body and the treating device (20). A controller (40) is configured to change an operating characteristic of the treating device (20) in dependence on the information generated by the imaging module (30). The present application also relates to a treating device configured to be used in a system as described above and a method for treating a part of a body to be treated.