Due to natural aging of the body and photoaging caused by UV radiation, the skin of the neck will gradually lose elasticity and produce wrinkles, which can be treated by hi-body neckline injections. Hi-body, i.e. sodium hyaluronate complex solution for injection, is suitable for those who have obvious neck lines and wish to improve them by non-surgical means. Patients should choose a regular plastic surgery institution to consult before the operation, and the standardized operation can effectively prevent complications. However, if chosen in an unqualified institution or not paying attention to the operation specifications, the following risks may arise: 1. Acute complications: usually occur within 72 hours after injection and may include tachyphylaxis, transient erythema, edema, sclerosis, pruritus and petechiae; 2. Early complications: occur within days to weeks after injection and can include overcorrection, local infection, skin necrosis, herpes recurrence, skin color changes and persistent local symptoms such as erythema, edema and hyperpigmentation; 3. Long-term complications: specifically infection, filler displacement, delayed hypersensitivity reactions, foreign body granulomas and scar formation. Anti-inflammatory agents are generally added to help reduce the incidence of inflammation and pain relief, but medications with potentially serious side effects should be avoided.