The bruises are often caused by the following reasons: 1, excessive local bleeding, because bruises are the performance of local subcutaneous blood seepage, when the bleeding is more slow absorption, you can promote the absorption of bruises through local physiotherapy and hot compresses. 2, poor local blood supply, such as nails, limb joints and other poor blood supply, will lead to slow absorption of hematoma. If there is infection, it will lead to slow absorption of the hematoma, which needs to be treated with antibiotics and, if necessary, oral medication to clear heat and lower fire, such as Jin Yin Hua Oral Liquid or Shuang Huang Lian Oral Liquid, etc. 4. There are also some rare causes, such as continued local blood seepage, which will also lead to slow absorption of the bruise. In short, if there are obvious local skin abnormalities, you can promptly go to the hospital surgery or dermatology department for consultation and treatment, and the doctor will treat according to the examination results.