How long it takes for a facial abrasion to fall off naturally after scabbing depends on the severity and cannot be generalized. General minor abrasions can fall off in a week or so, the more serious may need about half a month or even longer. After the face abrasion must be timely cleaning and disinfection, remove the wound foreign body, external erythromycin ointment and other drugs coated wounds, prevention and treatment of infection; or use iodine volts and oil gauze to cover the wound, and change the medicine regularly. After the injury, you should be vaccinated against tetanus to prevent tetanus. Follow the doctor’s instructions to take amoxicillin, cefaclor and other antibiotics to prevent infection. In general, if treated well, minor abrasions can come off in about a week, while more serious ones may take about half a month or even longer. After the injury to do on time to change the medicine, reasonable light diet, the affected area after the scabs can not be arbitrary tearing scabs.