Injury to skeletal muscles can also result in hematomas. Doctors classify muscle injuries as mild, moderate, and severe. Moderate or grade II injuries many develop palpable hematomas within two to three days.
The worst type, grade III injuries, involves severe pain, muscle rupture, and extensive hematoma. In these cases, surgery may be necessary if the injury is severe enough. The surgeon will drain the hematoma and make other surgical corrections to the muscle and surrounding tendons and ligaments.

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