Hyaluronic acid injections have become the mainstay of lunchtime beauty treatments and are the first choice for many beauty lovers. Hyaluronic acid has the advantages of no surgery, only injections, immediate results and almost no recovery period for facial rejuvenation and contour reshaping. However, objectively speaking, there are two sides to everything. In a very small number of patients who have had hyaluronic acid injections, local bruising can occur, which is caused by bleeding due to the needle piercing local capillaries. Although the incidence of bruising is extremely low, once it occurs, it takes 7 to 10 days for the bruising to dissipate, causing pain to the candidate. What can be done to prevent bruising caused by hyaluronic acid injection? In my long-term clinical work, I have summarized a set of methods to reduce the occurrence of bruising, both for the doctor and for the candidate. 1, The candidate should stop using aspirin, blood-stasis-activating herbs and other factors that cause bleeding two weeks before the injection, otherwise the incidence of bruising will increase. 2.The chances of bruising will be greatly increased if the candidate suffers from coagulation disorders such as hemophilia and thrombocytopenia, and even some candidates are not suitable for hyaluronic acid. 3, the doctor should be extremely familiar with the local anatomy, avoiding the parts that can easily pierce the blood vessels, which has high requirements for the doctor. 4.The use of ice before injection can not only provide analgesia, but also shrink the local blood vessels and reduce the chance of puncturing them. 5.Local application of topical lidocaine numbing cream can shrink the blood vessels in the skin and reduce the possibility of skin bleeding. 6.The local application of numbing medicine with epinephrine can not only shrink the blood vessels well and reduce bruising, but also make you completely painless and have a good feeling when injecting hyaluronic acid. 7.Use blunt needle as much as possible when injecting, which can reduce the chance of piercing blood vessels. 8.Local compression and icing within 48 hours after injection is very important, local compression is the most effective means to stop bleeding. Tell you a simple method, in the evening of the day after the injection with 4 degrees of soft milk ice bag compression and ice compress injection area, of course, the strength of compression should follow the doctor’s advice. By taking these precautions, the occurrence of post-injection bruising is extremely rare in our treatment.