A bump on the back of the head, which is painful when pressed, needs to be treated according to the different causes. Some of them are caused by infectious rashes that cause a bag on the back of the head and this bacterial infection can cause pain when inflammation occurs. The treatment can be topical ointment and oral anti-inflammatory drugs, topical fusidic acid cream or Bactrim ointment, oral amoxicillin, cephalosporins. If a septic infection develops on the skin, surgical drainage is required, followed by anti-infective medication. During the treatment period, attention should be paid to changing medication, and local cleanliness and dryness should be paid to avoid re-infection. It is also important to pay attention to whether the tumor disease is causing the bag at the back of the head, and whether the bag is a skin lesion or an intracranial lesion. The increase of tumor disease will also result in a bag at the back of the head, and the seriousness of the disease will lead to painful pressure, which needs to be treated according to the nature of the tumor, and if necessary, surgical removal. It is necessary to take treatment according to the nature of the tumor, and if necessary, surgery is needed to remove it. Don’t panic when a bag appears on the back of the head, but take treatment as soon as possible according to the different conditions.