A minimally invasive skin treatment device, comprising: a handpiece having a perimeter elevation (104, 202) and a top (103, 201) which cooperatively define a recessed area (105, 1406), an inner side of the perimeter elevation (104, 202) and the top (103, 201) defining an apposition surface facing into the recessed area (105, 1406); a conduit (107, 213) extending through a side of the perimeter elevation (104, 202) to the recessed area (105, 1406); a tool (102, 303, 1001, 2401) configured to at least partially extend through the conduit (107, 213) and into the recessed area (105, 1406); a guidance track (301, 302, 1103, 822) operably connected to the handpiece, wherein the guidance track (301, 302, 1103, 822) is configured to constrain a portion of the tool (102, 303, 1001, 2401) in contact with the guidance track (301, 302, 1103, 822) to move along a predetermined path to cooperatively move a distal end of the tool (102, 303, 1001, 2401) within the recessed area (105, 1406) in a plane parallel to the top (103, 201) of the handpiece and within a region of a predetermined shape defined by the predefined path; characterized in that the conduit comprises an entry hole disposed on an inner side of the conduit (107, 213) and facing said recessed area (105, 1406), said entry hole defining a tool (102, 303, 1001, 2401) pivot point when a distal end of the tool (102, 303, 1001, 2401) is inserted through the conduit (107, 213) and into the recessed area (105, 1406), wherein the conduit (107, 213) widens outward toward an outer side of the perimeter elevation (104, 202) such that a distal end of the tool (102, 303, 1001, 2401) inserted through the entry hole moves in one direction when a proximal end of the tool (102, 303, 1001, 2401) outside the conduit (107, 213) moves in an opposite direction. a handpiece having a perimeter elevation (104, 202) and a top (103, 201) which cooperatively define a recessed area (105, 1406), an inner side of the perimeter elevation (104, 202) and the top (103, 201) defining an apposition surface facing into the recessed area (105, 1406); a conduit (107, 213) extending through a side of the perimeter elevation (104, 202) to the recessed area (105, 1406); a tool (102, 303, 1001, 2401) configured to at least partially extend through the conduit (107, 213) and into the recessed area (105, 1406); a guidance track (301, 302, 1103, 822) operably connected to the handpiece, wherein the guidance track (301, 302, 1103, 822) is configured to constrain a portion of the tool (102, 303, 1001, 2401) in contact with the guidance track (301, 302, 1103, 822) to move along a predetermined path to cooperatively move a distal end of the tool (102, 303, 1001, 2401) within the recessed area (105, 1406) in a plane parallel to the top (103, 201) of the handpiece and within a region of a predetermined shape defined by the predefined path; characterized in that the conduit comprises an entry hole disposed on an inner side of the conduit (107, 213) and facing said recessed area (105, 1406), said entry hole defining a tool (102, 303, 1001, 2401) pivot point when a distal end of the tool (102, 303, 1001, 2401) is inserted through the conduit (107, 213) and into the recessed area (105, 1406), wherein the conduit (107, 213) widens outward toward an outer side of the perimeter elevation (104, 202) such that a distal end of the tool (102, 303, 1001, 2401) inserted through the entry hole moves in one direction when a proximal end of the tool (102, 303, 1001, 2401) outside the conduit (107, 213) moves in an opposite direction.