The easiest and quickest way to remove age spots is liquid nitrogen freezing. Depending on the size of the rash, if the rash is small, CO2 laser is also a better treatment. Age spots are keratotic papules formed by skin aging, ultraviolet radiation from sunlight, etc., which protrude from the skin surface. Liquid nitrogen freezing can use very low temperature to make the papules and superfluous skin on the surface necrotic and crusty, and fall off as the scabs fall off, but liquid nitrogen freezing is not easy to grasp the depth and may leave scars. For small age spots, carbon dioxide laser is more recommended to use the thermal effect of laser to burn and smooth out the protruding age spots, but for larger and more age spots, the laser will be more invasive and more expensive, so it is recommended to choose the best plan combined with the specific number and size of age spots.