Fall injury broken skin crust hardening, is broken ooze drying formation of scabs, the main component of platelets and fibrin, can play a certain protective role, usually to be under the scab after the tissue healing will fall off on their own. After a fall, there will be localized skin damage, the coagulation system is activated, platelets and fibrin in the trauma wound coagulation, the formation of lumps of objects, is the scab. As the wound heals, the scabs usually fall off and the wound initiates the repair process to form a scar. The scabs are primarily there to protect the wound from infection or direct contact with moisture or other foreign objects. When a traumatic wound forms a scab, it is best not to detach the scab on your own, as this can cause the wound to bleed, or in severe cases, become infected, leading to a worsening of the localized condition.