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A contusion occurs when blood vessels are damaged or broken after an injury. The raised area of the contusion is the result of blood and fluid leaking from the injured blood vessels into the tissue. You usually see a discolored, purplish area that takes 2-3 weeks to go away.
The condition is a minor problem that usually needs little treatment. Consult with your doctor if the injury does not clear up within a few weeks or if it is severe.