Scratching the itch leaves black spots, may be due to hyperpigmentation, can be improved by topical medication, laser treatment, etc., at the same time need to pay attention to sun protection. 1. Itching caused by skin inflammation should not be scratched to avoid bacterial infection and hyperpigmentation. When the symptoms of black spots are mild, they can subside after a period of time, and can be improved by applying hydroquinone cream or fruit acid, and taking vitamin C-rich foods such as oranges and kiwi fruit orally. 2. If necessary, you can also take laser treatment surgery, the use of intense pulsed light to destroy subcutaneous melanin particles, can quickly and effectively remove hyperpigmentation. 3. In addition, you can apply sunscreen and use umbrellas during outdoor activities to prevent ultraviolet light from stimulating melanin cells and causing more melanin deposits. Do not scratch the skin when itching, so as not to aggravate the inflammatory reaction, patients are advised to go to the hospital and use drugs under the guidance of the doctor.