The black marks left by mosquito bites may be caused by localized melanin deposition, which can be eliminated through general life care, medication and medical treatment. 1. Life care: mosquito bites such as breakouts, scars and other lesions, coupled with ultraviolet radiation, may form hyperpigmentation. It will gradually fade over time, but pay attention to sun protection, such as going out with umbrellas, sunscreen, etc., suggest a light diet, avoid spicy, stimulating food, quit smoking and drinking, ensure adequate sleep, avoid staying up late. 2. Medication: You can use localized medication such as cumeneoside cream ointment and hydroquinone cream to promote skin metabolism and improve skin pigmentation. 3. Medical treatment: If the pigmentation is more obvious and has a greater impact on the appearance, you can consider using picosecond laser, chemical peeling and other medical methods to accelerate the decomposition or metabolism of melanin, and improve the black marks. The black marks left by mosquito bites after the general life care ineffective, or when the symptoms are serious, it is recommended to consult a doctor in a timely manner, under the guidance of the doctor to choose the best treatment program, avoid private medication, in order to avoid adverse consequences.