Finger bruises black don’t bloodletting treatment, bloodletting treatment is not a formal treatment method, for any disease has no clear efficacy, finger bruises black may be due to peripheral circulation disorders, there may be due to lack of oxygen caused by different reasons, different treatment methods. 1. Peripheral circulatory disorders: cold environment, low body surface temperature, there can be peripheral circulatory disorders, finger frostbite resulting in bruising black performance, treatment can not be bloodletting treatment, but should be slowly rewarming to restore peripheral circulation. The root of the finger for a long time ligature fine rope leads to finger peripheral circulation obstruction, can also appear finger bruises, black performance. 2. Lack of oxygen: Lack of oxygen can lead to low content of oxidized hemoglobin in the human body, which can be manifested as blackened finger bruises, the treatment should lift the factors that lead to respiratory distress, and can be treated with oxygen through nasal catheter or face mask. In addition to the above reasons, other factors can also lead to the symptoms of blackened finger bruises, and it is recommended to consult a doctor for timely treatment.