Hi body neckline removal surgery through ultra-micro infiltration technology, break through the skin barrier, positioning, fixed layer, quantitative delivery of nutrients, enhance fibroblast collagen synthesis, improve collagen fiber synthesis, restore the neck skin elasticity and smoothness, effective skin rejuvenation and hydration, shrink pores, brighten skin tone, tighten and lift, repair neckline. However, if the plastic surgery institution chosen is not formal, it can bring the following risks: 1, within 72 hours after injection can appear rapid-onset hypersensitivity reaction, manifested as transient erythema, edema, hard nodules, itching and petechiae; 2, early postoperative overcorrection, local infection, skin necrosis, herpes recurrence, as well as skin color change and lasting local symptoms, such as erythema, edema, hard nodules, itching and hyperpigmentation; 3, postoperative Infection, filler migration, delayed hypersensitivity reactions, foreign body granulomas and scar formation may occur in the distant future. The addition of anti-inflammatory adjuvants can help reduce the occurrence of inflammation and pain in order to avoid the use of drugs with potentially serious side effects; 4. Uneven pigmentation and local small vessel embolism are mainly caused by improper operation. Therefore, it is recommended to choose a regular plastic surgery institution for medical treatment, standardized surgical operation and postoperative care, which can effectively prevent adverse reactions.