Potion spotting may be able to get rid of the discoloration, but it is more likely to cause irreversible scars. Common pigmentation spots include freckles, melasma, nevus of Ota, brownish nevus, etc., all located in the dermis. The principle of action of spot spotting with potion is mostly using corrosive liquid to cauterize the skin around the pigmentation. However, once the damage enters the dermis, the repair process will inevitably leave a scar, and this scar will definitely be more obvious than the previous pigmentation. In fact, most of the discolorations can be reduced by less sun exposure. For melasma, oral intake of Siwu Tang and Liu Wei Dihuang Wan also has certain effect. At present, the most definite effect of medical treatment for pigmentation is gemstone laser, 755nm or 1064nm wavelength, after 3-4 times of treatment, most of them can reach satisfactory effect.