The Q-switched Nd:YAG laser emits a longer, near-infrared ray of 532, 1,064 nm that is capable of penetrating into the deeper regions of the skin. Therefore, it is able to destroy deep-seated dermal pigment by selective photothermolysis. TreatmentTattoo, Lentigines, Freckles, Birth mark (Ota,Nevus of Ito,mongolian spots, Hori's nevus, Cafe-au lait macules)