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Outside of blood vessels, thiscollection is called a hematoma. A bruise occrs when capillaries are damaged and blood seeps out, usually after blunt trauma. Less severe than either of the above. Blood clots occurs within blood vessels, when liquid blood solidifies. Outside of blood vessels, thiscollection is called a hematoma. A bruise occrs when capillaries are damaged and blood seeps out, usually after blunt trauma. Less severe than either of the above.
Definition. 1  A blood clot is a thickened mass in the blood formed by tiny substances called platelets. Clots form to stop bleeding, such as at the site of cut. 2  As soon as a blood vessel wall is damagedâby a cut or similar traumaâa series of reactions normally takes place to activate platelets to stop the bleeding.