1. Please inform the doctor of all the drugs you are taking before treatment. Some hemodilution drugs (anticoagulants) such as aspirin, ginseng, ginkgo biloba and garlic extract may cause more bruising or bleeding at the injection site, so you should let your doctor know your medical history in the past six months before treatment. 2. If you have had facial plastic surgery or laser surgery in the past six months and have implanted any medical items, please inform the attending doctor in advance. Such as rhinoplasty, photoelectric wave laser and so on. 3. If you have all kinds of severe allergic symptoms, or whelk and acne or a wound at the treatment site, please discuss with the doctor whether to postpone the treatment to avoid local opportunistic infection caused by minimally invasive wound at the operation site. 4. Local anesthetic can be used in water gun treatment. If you have a history of allergic reaction to anesthetics, please inform your doctor before operation.