Clinical signs of HIV infection are not typical, and there is no way to deduce whether or not you have HIV infection from the presence of a bruise on your leg. Bruising may or may not be present on the legs of a person with HIV. Bruising doesn’t always occur in HIV-infected patients, but may occur if there is a collision or some other trauma. Such as HIV invasion of bone marrow, causing bone marrow hematopoietic function decline, platelet synthesis, and a variety of opportunistic infections caused by excessive platelet consumption, resulting in skin bleeding, bruising can occur. If the patient has accidental exposure to AIDS, or the existence of high-risk sexual contact with HIV-infected patients, bruises on the legs, need to go to the hospital in time for routine blood tests, and at the same time for HIV antibody antigen test. If the test is negative in three months, the infection can be completely excluded. If HIV infection is ruled out, you should go to the hematology department in time to determine the cause of the bleeding and treat the cause.