The common clinical causes of blackening of the patient’s thumb are mainly the following: a. Accidental contusion of the patient’s thumb can cause superficial soft tissue capillary rupture with local bruising formation. At this time, the bruise in the process of absorption, will be manifested as the blackening of the thumb symptoms. Local topical application of blood-stasis ointment and oral administration of Panax ginseng powder can be given to improve the blood circulation of the thumb. Promote local blood stasis to be absorbed faster so as to improve the symptoms of blackened thumb. Second, if the patient’s upper limb artery occlusion, can cause hand limb ischemia, hypoxia, manifested as cold skin temperature, thumb local color black, at this time can be through the upper limb artery ultrasound and angiography examination, clear the specific location of arterial vascular occlusion. If necessary, arterial balloon dilation or stent implantation can be performed to dilate the arterial vessels and improve the symptoms of black thumb.