Dead blood inside the thumb of the foot, i.e., bruising, may be caused by trauma, and can be treated with local ice packs and surgical treatment. Bruised blood inside the thumb of the foot may be caused by trauma resulting in rupture of blood vessels in the thumb, overflow of blood separating the surrounding tissues, and the symptom of dead blood inside the thumb of the foot will appear. In general, there is no need for special treatment, can be relieved by local ice packs, a period of time can be self-absorbed, if not self-absorption is recommended to take a surgical incision to draw out the dead blood. Therefore, patients with dead blood inside the thumb of the foot should go to the hospital as soon as possible to identify the cause of the disease, and actively cooperate with the doctor for treatment after diagnosis.