Foot scratches can be coated with purple potion, but it is less used at present, and patients are advised to rinse the wound first, and then use iodine povidone to apply the foot wound. Purple medicine is gentian violet, which is a kind of disinfectant with bactericidal effect. When a patient has a cut on the foot, he or she can apply the violet solution appropriately to avoid the occurrence of infection. However, due to the potential risk of carcinogenicity of violet water, it is currently used less clinically. Clinically, patients are usually advised to rinse the wound first, preferably with hydrogen peroxide or saline, or with water, and then use iodophor to disinfect the wound area. In general, due to the special location of the feet, the risk of infection is higher, patients should pay more attention to the wound site cleaning and disinfection, if the patient’s wounds are deeper, also need to carry out tetanus vaccination.