Generally speaking, the spot spotting anti-blackening can be recovered in about 1-2 weeks, but the specific recovery time also depends on the individual skin repair situation and the degree of skin damage. Potion spotting is to use the corrosiveness of suitable concentration of acidic substances, such as trichloroacetic acid, carbolic acid, etc., to corrode the spots to achieve the purpose of spot removal. Under normal circumstances, the skin in contact with the potion will turn black. After the normal metabolism and self-repair of the skin, the anti-black skin can be restored to normal in about 1-2 weeks. It should be noted that the skin is divided into epidermis, dermis and subcutaneous fat layer. The damaged epidermis can be restored to normal after 1-2 weeks of repair, but if the damage reaches the dermis, the damage may not be recovered because the dermis is rich in elastic fibers, collagen fibers, blood vessels and nerves. After the anti-black spotting, you cannot peel off the anti-black skin by yourself to avoid damaging the self-repair of the skin and damaging the dermis, which may form skin scar, and you need to wait for the anti-black skin to grow and repair and fall off by yourself. Therefore, it is not recommended to spot spots with medicine. If you want to get rid of spots, it is recommended to go to regular hospital dermatology department for photoelectric treatment, which has good effect and little side effect.