The forehead was injected with hyaluronic acid, and the place where the needle was inserted bulged out a large white bag,

Different doctors use different techniques and needles, and the swelling period will vary greatly. With a sharp needle, the trauma is larger, the bleeding is more, and the swelling recovery period is relatively longer. With a blunt needle, the trauma is relatively small, and there may be slight swelling within a day or two, but it is likely that others will not see it, and it will not affect the work. In general, after injection of hyaluronic acid, it will swell a little more than other injections, because hyaluronic acid is very strong in water retention, and there will be a water absorption reaction on the second day of injection. Lighten, basically can't feel it after a month, it becomes natural. If there is redness, swelling and local fever three to five days after injection, it is usually due to infection. You must go back to the doctor for treatment. In addition, if there is abnormal pain or color change in the local area, it may be ischemic necrosis, and you must also inform the doctor. .

A very small number of people will have "delayed allergic reactions". Many people think that they are fake products when they find that they are swollen. In fact, this is precisely the unique feature of hyaluronic acid injections. Some people suddenly have a swollen jaw or nose after half a year or a year of injection, like absorbing water, and recovering after two or three days. This situation is caused by the release of cross-linking agents during the degradation of macromolecules. This delayed allergic reaction may appear directly a few months after the injection, and hyaluronic acid with a larger molecular weight may appear six months, a year or even two years after the injection.

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