We can often see that some entertainment news broke out that a certain actress suspected of having too much hyaluronic acid, resulting in the whole face puddles and stiff expression. Is this really the case? In fact there are many culprits that lead to facial stiffness …… 1, over-injection when used for cheek augmentation Hyaluronic acid is used for shaping and filling, it has a certain degree of hardness, so if too large an area or too much hyaluronic acid is injected, it may lead to facial stiffness and unnatural expressions. 2, the injection level does not match the product When hyaluronic acid is used for shaping and filling, it should be injected into the deep dermis layer, like the kind of shaping of rhinoplasty even to the periosteal layer. You should choose a large molecule hyaluronic acid with a high degree of cross-linking, which is not easy to disperse. After the injection, professional massage is needed to help shape and at the same time make the hyaluronic acid more evenly distributed. As for hydration injection, which is a shallow injection, only small molecules with easy dispersion and good decomposition and low or no cross-linking hyaluronic acid should be injected. Otherwise, if the skin cannot stand it, it will produce hard knots, thus making the skin in the affected area uneven, stiff and unnatural. 3.Severe inflammatory reaction Some people find that when they inject hyaluronic acid for the first time, they tend to get more ideal results. However, after a few times of re-injection, you will find that the injected area starts to become unnatural and even some small particles appear. This is because hyaluronic acid is a “foreign substance”, it will not stay in the body permanently, it will be metabolized and lost. The process of digesting and metabolizing the injected hyaluronic acid by the body’s immune mechanism is an inflammatory reaction. If hyaluronic acid is injected repeatedly, the tissue in the affected area will have frequent inflammatory reactions, and the area will become less natural than it was – this is one of the reasons why we find that many people’s faces become unnatural after multiple hyaluronic acid injections. However, the physician’s injection technique and the individual body type of the candidate may also be factors that affect the inflammatory reaction and cannot be generalized. So the question again comes can we avoid stiffness after injection? The answer is yes! 1.First of all, you must find a professional injection doctor and institution. Good operating techniques and rich operating experience can try to avoid stiffness and unevenness caused by operating errors. And professional institutions with a complete surgical environment can avoid infections and granulomas caused by improper disinfection and poor aseptic awareness. 2, followed by a rational view of hyaluronic acid injections There are some beauty seekers who feel that since hyaluronic acid will be metabolized, it is better to play more at a time to keep it for a longer time; there are also some people who are overly dependent on hyaluronic acid and hate to “reshape the whole face” and have to make up for it immediately when it goes down a little. This is a big reason for the unnatural post-operative effect.