A hand-held laser treatment device automatically sweeps a line of laser energy across a treatment area of a patient without moving the device. Laser energy sources reside in a scan head housing, which is rotatably connected to a body housing at a housing mount. A motorized scanning mechanism in the body housing drives a pushrod connected that is to the scan head to cause the scan head to reciprocate about the housing mount axis, moving an emitted line of laser energy up and down. The scanning mechanism comprises a rotational motor, a pushrod drive cam, a guide cam and an amplitude adjustor, all coaxially aligned along a motor axis. Interposed between the pushrod drive cam and the guide cam are the pushrod and a guide bearing aligned along an axis parallel to the motor axis. The degree of sweep is adjustable to change the size of the area treated.