Increases the speed, quality and tensile strength of tissue repair including reduction of fine lines and wrinkles. Cold laser therapy usa. back pain, knee, shoulder, neck, arthritis, neuropathy may help promote healthy hair regrowth. Great for on the go cold laser treatment. The Laser Therapy pen can be used directly on the skin or held further away, as far as 1ft to cover larger areas for example neck muscles, shoulder muscles, or back muscles.