The brown marks left behind after water spotting, that is, hyperpigmentation, the specific how long can be eliminated with the patient’s skin damage, body metabolism speed, post-care and other factors related to the general disappeared in about 3 to 6 months. Potion mole spotting that is the use of certain chemicals corrosive effect of destruction of skin pigmentation mole, generally can cause damage to local tissues, can lead to local hyperpigmentation brown marks such as skin damage is more serious, the brown marks of a larger area, it is difficult to completely subside, and subside for a longer time. Some may take about 6 months or even a year to fade slowly. Some patients with pigmentation range is not large, generally 3-6 months or so will fade significantly; in addition to the elimination rate is also related to the patient’s body metabolic rate, the body metabolism faster patients, the mark elimination faster, and vice versa is slower. Different patients have different post-care situation, such as patients with proper post-care, such as not strictly sunscreen, scratching and other mechanical stimulation of the local area, the recovery will be slower or even aggravate the hyperpigmentation. Since medication for mole removal is easy to cause color deposition and scarring, it has been basically abandoned in clinical practice, and it is recommended that patients who are willing to be treated go to regular hospitals in time to avoid the adverse consequences caused by blind treatment.