The main reason for the hyperpigmentation of wounds may be due to the fact that after the patient is injured, the medical personnel use iodophor disinfectant to disinfect the local area, which, over time, leads to the local skin of the wounds and the appearance of hyperpigmentation, resulting in the phenomenon of blackening. In this case, 7-10 days after the wound heals, can completely disappear. There may also be due to wound scar formation, which leads to localized hyperpigmentation, which generally disappears for a longer period of time, and may take 1-2 years, or even 3 years. Because this is a scar softening process, the process is slow. It is recommended that in case of scarring, timely application of scar removing drugs for treatment can effectively alleviate the phenomenon of hyperpigmentation.