All the laser spot removal devices can directly knock down melanin through different wavelengths of light waves to achieve the effect of removing or lightening spots, which is safer and will not leave scars, such as picosecond light waves, nano light waves, Q-modulated laser, etc.. Nano light wave is the upgraded version of Q-modulated laser, which can smash the spots more, safe, less damage and fast recovery, and it can get rid of the spots with clearer boundary, but cannot cure freckles at root. Freckles include three forms, such as clear freckles, blurred freckles, and unexcelled freckles, and only through the technique of spot removal and separation can the freckles be completely removed. The precautions after doing nano light wave freckle removal are as follows: 1. After the operation, sterile gauze will be placed on the treatment area, while ice packs will be used for 30-60 minutes; 2. Keep the freckle removal area clean and dry, and do not touch water before local scabbing to prevent infection; 3. Half a month to half a year after the treatment, make sure to do a good job of sun protection, whether indoors or outdoors, sunscreen needs to be applied. Avoid eating spicy and stimulating food, and avoid smoking and alcohol; 6.