The darkening of the back of the hand and fingers after the swelling has subsided is a common manifestation during the recovery period, and will not lead to obvious abnormalities in the physical condition, which is mainly related to bruising and pigmentation. 1. Bruising: After trauma, it will cause local swelling and capillary rupture, resulting in local blood stasis, which will cause local bruising and darkening of color after the swelling subsides. 2. Pigmentation: local injuries can cause aseptic inflammation, inflammation in the absorption process, the epidermis will appear intracellular pigmentation, which can also cause the corresponding symptoms. After the swelling of the back of the fingers and hands become darker, if there is no discomfort, it can be observed and does not need to be treated; if accompanied by obvious pain and discomfort and activity restrictions, it is necessary to consult a doctor in time to observe and further diagnose the condition of the corresponding tissues, and carry out standardized treatment under the guidance of the clinician, so as to avoid delaying the condition by not neglecting.