Hello, once the scar is formed, any medicine is useless. Laser treatment can be considered, and skin can be transplanted surgically if the area is large. For example, new wounds can be externally applied with drugs, such as Kangruibao, scar antipruritic and softening ointment, Shuhengning, and silica gel drugs. , each has its own use. Never forget to avoid irritating wounds, such as friction, scratching, strong sunlight, water with too high or too low temperature, etc.