The blackening of the wound is often caused by the following reasons, including tissue ischemia, tissue infection, bruising, pigmentation, etc., as follows: First, tissue ischemia: when the local tissue ischemia, the color will be blackened, and you need to go to the surgery department of the hospital as soon as possible, and find the attending physician to have a look at it. If for the problem, need to give the expansion of blood vessels and the corresponding disposal. Second, local tissue infection: may be caused by local tissue infection, need to go to the hospital as soon as possible to improve the examination, and give antibiotics for treatment. Third, bruising: it may be caused by bruising underneath the wound, then you need to actively look for triggers, if the bleeding is not too much then don’t worry too much, and bleeding is more, you need to be cleaned to stop bleeding. Fourth, hyperpigmentation: some patients are caused by local hyperpigmentation. After the wound appears black, patients should pay attention to diet, for example, can not drink drinks containing alcohol, do not eat too spicy food, can be appropriate intake of fresh fruits and green vegetables, appropriate intake of low-fat high-quality protein, in order to promote wound healing.