Bruising occurs when blood becomes trapped under the skin, usually following an impact injury that damages small blood vessels. However, not all bruising has a simple explanation. Although random or ...

Bruising on the legs may be due to a minor injury. Unexplained bruising may also result from vitamin C or K deficiencies, liver disease, autoimmune conditions, low platelet counts (thrombocytopenia), ...

A bruise, also called a contusion, happens when a small blood vessel just under the skin’s surface breaks and blood leaks into the surrounding tissue. Bruises are most commonly caused by an injury, ...