The dangers of breast piercing include the possible formation of hematomas, localized infections, and pneumothorax, which can be treated with care or medication. 1. Formation of hematoma: If proper pressure is not applied after breast puncture, there is a risk of bleeding, and a hematoma can form over time. If there are no high risk factors for bleeding after the puncture, a compression bandage is sufficient; if bleeding occurs then compression is needed to stop the bleeding. 2. Localized infection: patients may have localized infection after breast puncture, and anti-inflammatory and anti-infection drugs such as cephalosporin, azithromycin and erythromycin can be used to alleviate the infection phenomenon. 3. Pneumothorax: Because the mammary gland is a surface organ, if the lesion is deeper and the puncture is not sure of the strength, it will cause pneumothorax. Patients can rest in bed or undergo thoracocentesis or closed chest drainage and other therapeutic treatments. After breast puncture surgery, patients should not touch the wound with their hands, or the puncture site is wet or in contact with other contaminated liquids, and at the same time, they should not remove the gauze at will, so as to avoid infection. Patients should go to the hospital immediately for treatment if they have any discomfort after breast piercing.