Hematome: An acute hematoma develops immediately after the trauma or surgery, whereas a chronic hematoma can develop over time and may be associated with a slow bleeding or extravasation of blood.
Answered 5/25/2018
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Varies: This will vary some with the location and the size of the blood vessel(s) broken that give rise to the hematoma.Multiple tiny vessels under a nail may take minutes.A big vessel under the scalp may accumulate a hematoma over several hours.
Answered 2/19/2020
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