The bruising on the body may be physiological factors, but also may be the manifestation of certain diseases, such as vitamin C deficiency, thrombocytopenia, etc., should be timely consultation to find out the cause of the disease. 1. Physiological factors: If the body is bruised when touched, it may be caused by the fragility of capillaries, generally no blood system abnormalities, usually do not need special treatment. 2. Pathologic factors: (1) Vitamin C deficiency: patients with vitamin C deficiency suffer from scurvy due to decreased densification and increased permeability of capillaries, which can lead to capillary rupture in the case of a minor collision, and blood leaks out of the blood vessels to the outside of the blood vessels, resulting in subcutaneous bruising. (2) Thrombocytopenia: patients with thrombocytopenia, so it will lead to abnormal coagulation function, when harmed by external forces, the blood circulation is too slow, no normal coagulation repair, so it is easy to cause the skin bruises when touched. In addition to the above factors, do not rule out other factors. It is recommended that patients go to the hospital as soon as possible to check by the doctor to clarify the cause of the disease, and then give targeted treatment.