A contusion is defined as a lesion of a part of the body, causing pain without having any visible clinical signs. It appears following a more or less violent shock and the affected zone is painful, though there may be no visible mark of trauma. When it does cause coloration, red, purple, black, blue, or yellow, according to the seriousness and the evolving stage of the contusion, due to a small hemorrhage of tissues under the skin, it is known as a bruise. In case of isolated swelling of the afflicted zone, it is called edema, resulting from an inflammatory reaction. If the skin is reddish as well as swollen, it is hematoma, which is caused by an accumulation of collected blood. Contusions are generally benign and resolve themselves after several days.
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. Translated by Jeff