Mosquito bites scratching the skin and leaving scars, the common clinical general inflammatory hyperpigmentation, scarring and other problems, can be improved by laser treatment, topical drugs. 1. Inflammatory hyperpigmentation: manifested as local red, dark brown deposits, can be treated by intense pulsed light therapy, can also choose to improve the external use of hydroquinone cream with decolorizing effect. At the same time, attention should be paid to strict sun protection to avoid aggravation of hyperpigmentation. 2. Keloid scar: Silicone gel, onion extract preparation, such as silicone patch, compound heparin sodium, etc. should be used in the early stage of keloid scar formation to inhibit keloid scar proliferation; photoelectricity treatment, such as carbon dioxide fractional laser, etc. can also be chosen to improve the appearance of keloid scar. The above drugs and treatments should be used under the guidance of specialists, and it is recommended to consult a regular hospital to clarify the condition and treat the symptoms.