A needle device (6) comprising a housing which can be mounted to an injection device (1) is disclosed. The housing comprises a first housing element (13) provided towards a proximal end of the needle device (6) and a second housing element (15) provided towards a distal end of the needle device (6). A cutting element (14) having a sharp proximal end is arranged at a proximal end of the first housing element (13). A cannula having a blunt proximal end (11) is fitted to the second housing element (15) and an opening for the cannula (11) is provided at the proximal end of the first housing element (13). The first housing element (13) and the second housing (15) element are moveable relative to each other between an extended position where the proximal end of the cannula (11) does not extend beyond the proximal end of the cutting element (14) and a compressed position where the cannula (11) extends through the opening of the first housing element (13) and past the proximal end of the cutting element (14). This construction greatly reduces the risk of post-treatment bruising and tissue trauma.
