There are several reasons for the whitening of the bruise wound: first, due to the epidermal bruise after the exposure of the fascia, the subcutaneous fascia this part of the absence of blood vessels, so the wound is shown to be white. In this case belongs to the more superficial abrasions, you can apply topical medicine, so that the wound to keep dry. Second, the wound bruise if white may be injured to the bone, the periosteum exposure, this wound whitening is a more serious situation, should be promptly to the hospital for related examination and treatment. In this case the wound is often deeper, to ensure good wound healing through thorough debridement treatment. Third, bruise wound whitening may also be injured for a longer period of time, the emergence of infection caused by the wound infection after whitening this situation to immediately go to the hospital for examination and symptomatic treatment.