After the appearance of hematoma in the organism, until the subsequent mechanization and complete absorption, the process is very slow, and sometimes it even takes more than half a year to achieve. There are several main mechanisms for this situation: 1. After the hematoma appears, the surrounding hematoma will first gradually turn into a blood clot, which is what the common people call bruises. After that, a series of inflammatory reactions will occur, causing the hematoma here to gradually turn into granulation and scar tissue. Once this step is reached, the pathologic process further down the road is relatively slow. The scar tissue here is gradually replaced by normal tissue crawling, which is a normal resorption process. So overall, this pathological change is relatively slow.2. The so-called hematoma refers to a relatively large subcutaneous hemorrhage, and when there is a large subcutaneous hemorrhage, of course, its rate of resorption is a little bit slower.3. After the appearance of the hematoma, there is the possibility of very small, continuous bleeding, which can lead to the hematoma in the process of mechanization and resorption, and then there is a recurrence. Therefore, the reasons mentioned above will lead to a longer time for the hematoma to be mechanized and absorbed.