Found this FWIW
Posted on: November 12, 2018 at 11:19:55 CT
Mo Texan
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"A bruised shoulder(contusion)causes pain, swelling, and sometimes bruising on the skin. While there are no broken bones the injury will take from a few days to 6 weeks to heal, depending on how severe it is. Moderate to severe shoulder contusions are treated with a sling or shoulder immobilizer. Minor contusions can be treated without any special support."