1.What kinds of hyaluronic acid are there and how are there topical/injectable ones? Hyaluronic acid is also called hyaluronic acid, the first contact is orthopedic and ophthalmic (non-cross-linked) sodium hyaluronate, which is used for injection into the joint cavity, as well as the eye. There are also topical masks containing hyaluronic acid (original liquid) for moisturizing. In recent years, hydration injections have emerged, which are non-cross-linked hyaluronic acid (which may also contain a small amount of cross-linked hyaluronic acid) injected into the skin layers for the purpose of better water retention. Nowadays, we have been discussing about the Rheinland/Joartem/Ewan/Runbaxy, which are cross-linked hyaluronic acid. This includes single-phase cross-linking and two-way cross-linking. 2.I am breastfeeding, can I have hyaluronic acid? It is different from Botox. There is no experiment to confirm the potential risk of hyaluronic acid to pregnant women. Therefore, I personally believe that hyaluronic acid can be used after the end of the “month”. 3.How much hyaluronic acid should be injected for tear troughs and nasolabial folds? It depends on the degree of depression. For tear troughs, it is 0.3-0.5ml unilaterally (injected on the surface of periosteum), and the dosage is reduced if injected subcutaneously. The nasolabial folds are 0.5-1.5 ml unilaterally, if heavier, subcutaneous filling is needed. 4.Will there be residual hyaluronic acid in Yimei? Yimei is different from other hyaluronic acid. It is not “pure”. It contains “methylcellulose”. A lot of clinical practice has proved that it is safe. 5.Will the root of the nose become wider after multiple injections of hyaluronic acid in the nose? If the original depression of the nasal root is obvious and the amount of injection is large, it is possible that the root of the nose will be slightly widened after multiple injections. Therefore, a small amount of Botox injection is usually routinely recommended for nasal dorsal lines – to reduce muscle compression. 6. I heard that repeated injections in the same area will leave residue each time and eventually no filler is needed? The absorption time of hyaluronic acid is 6-18 months. After secondary or multiple fillings, it is often seen that hyaluronic acid is not completely absorbed even after more than 1 year. It may be related to the formation of local envelope. 7.Will hyaluronic acid embolize the blood vessels? I am so afraid. How to avoid it? Yes, very rarely. It may occur between the eyebrows, nose, nasolabial folds, and temples. The risk can be reduced by filling the periosteal surface of the nasolabial folds and temples/using blunt needles/applying cold compresses or injecting epinephrine-containing local anesthetics before surgery. The key is to be familiar with the anatomy, operate gently, inject evenly and in small amounts, and reduce the number of puncture needles. 8.What if the flap is embolized? Immediate (within 1-6 hours) treatment is crucial, including injection of hyaluronidase / puncture and bleeding to reduce tension / vasodilator drugs / hormones, etc. 9.Which parts of the face are suitable for hyaluronic acid and which for fat? There is no strict definition, personally, I think the frontal/temporal/cheek and cheek furrows/upper lid hollows are suitable for fat. The nasolabial folds / tear trough / chin is suitable for hyaluronic acid – the absorption rate of fat filling is very high, or very difficult. The apple muscle is optional. 10. Is it easy to displace the apple muscle and “Indian lines” with hyaluronic acid filler? Yes. Therefore, the apple muscle is generally filled with no more than 0.5ml on one side. Local depression filling also needs to be cautious. 11.Can hyaluronic acid also enhance the face? Yes, it can. It can be used to lift the midface and lower face by local support. It can also lift the corners of the mouth/injected in the depression below the corners of the mouth. 12.I have a friend who has almost absorbed hyaluronic acid within a few months after injection? After hyaluronic acid injection, you need to avoid long-term high temperature environment: such as sauna/long time exposure to the sun, forbidden to stay up late, excessive drinking and smoking. Otherwise, the absorption rate of hyaluronic acid is higher. 13.I bought a few hyaluronic acid abroad, can you help me with it? At present, some beauty institutions provide similar services. But our hospital does not do it. The domestic approved hyaluronic acid is enough to cover all the parts, and the safety is more guaranteed. 14.Can I inject different brands of hyaluronic acid at the same time in the same area (nose/temples)? This “innovative cocktail” injection method is not recommended. Instead, you can change the brand of hyaluronic acid and inject it twice after it is almost absorbed. 15.I suspect that the injected hyaluronic acid is fake, how can I break it? It can be examined by MRI and high frequency ultrasound. You can also try to dissolve the hyaluronidase.