The melanin deposits left behind by mole spotting can be treated with medication, physical therapy, and general measures to regulate. 1. Drug treatment: black precipitation left behind after mole spotting can also be applied locally to hydroquinone cream and other skin discoloring agents. 2. Physical therapy: the melanin deposits left behind by mole spotting can be treated by laser irradiation such as picosecond laser, the melanin particles will be broken after laser irradiation of the local skin, and then the broken melanin particles will be discharged out of the body with the circulation of the body. 3. General measures: after mole spotting local melanin precipitation should ensure local cleanliness, need to pay attention to sunscreen when going out, you can apply sunscreen on the local or wear sunscreen clothing to avoid sun exposure. After mole spotting localized melanin precipitation need to consult a doctor in time, you can choose the appropriate way of treatment under the guidance of the doctor. It is recommended to eat vitamin-rich fruits and vegetables. If patients take laser treatment, avoid touching water after laser to avoid local infection.