Bruising after breast piercing is generally normal, but it may also be caused by local injury, thin breast skin and other factors, the specific circumstances need to be judged under the guidance of the doctor. 1. Normal phenomenon: In general, when breast puncture, the puncture needle may damage the local small blood vessels, thus the phenomenon of bruising, generally is a normal phenomenon, no special intervention is needed, and the symptoms will disappear gradually after 48 hours. 2. Local injury: When the patient takes breast puncture, due to improper operation, it may lead to local soft tissue damage and capillary rupture, which will lead to bruising. 3. Thin breast skin: The blood vessels of the mammary glands are more abundant, and the skin of some women’s breasts is thin, so it is easy to have bruises after breast puncture. Bruising after breast piercing may also be related to other factors. It is not possible to determine the exact cause based on one symptom alone, so it is recommended to consult a doctor in time.