See below: It may be scar tissue or dried fluid since the injury.
Answered 4/15/2018
5k views
Many causes.: Bruising and swelling can be caused by damaged blood vessels from the impact, but can also indicate that a ligament may be torn. Blood rushes to the area in order to help with healing. Serous fluid released from the torn tissues of the ligament also contributing to the swelling around the area of the injury.
Answered 5/8/2014
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