Understanding Bruises on the Body Causes and Treatments of Bruising Bruises, or purpura, are often the result of bleeding under the skin. Here’s a detailed explanation of the five common situations that can cause skin bruising and the corresponding treatments. Trauma-Induced Purpura Injuries are the most common cause of bleeding under the skin. When the skin is hit or squeezed, blood vessels beneath may burst, allowing blood to seep out and form a bruise. These bruises usually don’t need special treatment and will fade over time. Drug-Induced Purpura Certain medications such as aspirin, warfarin, and heparin can lower the blood’s... Learn more