Hematoma formation is mainly due to the rupture of capillaries or smaller arterioles, resulting in a local accumulation of blood. It is important to clarify that the hematoma that accumulates will contain, in addition to blood and blood cells, a variety of substances, including even fragments of broken tissue. Therefore, the process of hematoma absorption requires lysis of the larger necrotic fragments of tissue and cells, and after it is dissolved, it is then recovered by the lymphatic vessels as well as the normal blood vessels. Those that cannot be absorbed are removed by phagocytic cells, which separate and expel them, and the surrounding local tissue of the necrosis is mechanically wrapped, filling the defect with fresh granulation and regrowing back into normal tissue structure.