Chemical mole spotting refers to the application of weakly acidic or alkaline chemicals to cauterize the area where the mole is growing. The advantage of chemical mole spotting is that it can produce quick results, while the disadvantage is that the depth of the cauterization is not easy to control, and it is easy to leave scarring or hyperpigmentation. Commonly used concentration of 50 percent of the triazocarbonic acid solution gently point on the mole. 1. Advantages: easy to operate, can be quickly effective. 2. Disadvantages: If the diameter of the mole is larger than 0.5cm, chemical corrosion method of mole spotting generally can not get rid of the mole completely, and need to spot many times before spotting cleanly, and the depth of the burn is not easy to control, and it is easy to leave a scar or pigmentation. Therefore, it is more suitable for moles with shallow depth and light color. In addition, pigmented nevus itself is an abnormal growth of the skin, repeated stimulation may lead to malignant change of pigmented nevus, so the treatment needs to be cautious. This treatment plan is not recommended by regular medical institutions. At present, high-frequency electric knife, carbon dioxide laser and other photoelectric treatments are commonly used in clinical practice to get rid of pigmented nevus, so those who are willing to have the treatment are recommended to go to regular medical institutions to find a specialist to choose the appropriate treatment plan after the interview.