Face abrasion scabs 15 days still do not fall, may be the wound is deeper, there is an infection, physical weakness and other factors. 1. Deeper wounds: the degree of abrasion is different, if the abrasion area is deeper and larger, the formation of scabs may be thicker and larger. At this time, the wound repair is slow, the scab may not fall off for a long time. 2. Infection: scabs do not fall off for a long time, mainly to protect the wound. Local abrasions are not properly sterilized or infected, which may lead to scabs not falling off for a long time. 3. Weakness: everyone’s physique is different, if the physique is weak, nutritional status is poor, the affected area recovers slowly, which may cause the scabs to exist for a long time. It is recommended to pay attention to the care of the affected area, pay attention to nutritional supplements, if there are signs of infection such as redness, swelling, heat and pain, if necessary, go to the general surgery department of the hospital, under the guidance of the doctor for the medication, can promote healing.