Red spots on the back that do not itch are not necessarily AIDS. AIDS requires immunologic and genetic testing to confirm the diagnosis and is not diagnosed based on symptoms. About 2-4 weeks after the initial infection of the body with HIV, some patients will develop a rash. The rash may appear as red, reddish-brown macules or papules all over the body, or it may be purple or dark brown. Most rashes are scattered and usually have no itching symptoms and may subside on their own. However, the symptom of red spots on the back without itching is not a basis for diagnosing AIDS. Red spots on the back that do not itch can also be caused by other diseases, such as folliculitis, thrombocytopenic purpura and so on. To confirm or rule out AIDS, immunological and genetic tests, such as blood tests for HIV antibodies, are needed. If there is high-risk behavior, it is recommended to go to the hospital for examination in time and follow the doctor’s advice to review the test after the window period. If HIV infection is suspected, it is important to seek prompt medical attention and follow the doctor’s instructions for testing.