Fat-dissolving needle has not been approved by relevant departments in China, so it has not been carried out in formal medical institutions. However, there are relatively many adverse reactions of liposuction needles, such as pain, edema, ecchymosis, skin necrosis, inflammatory tissue and pigmentation. The side effects of liposuction needle are as follows: 1, dizziness, which is a common phenomenon in the process of liposuction needle injection. Because the ingredients in the fat-dissolving needle are similar to "caffeine", patients will have slight dizziness, which will generally disappear after injection. 2, swelling, almost everyone who has injected liposuction needles will have swelling at the injection site. This is because this injection will stimulate the human body and cause swelling. 3, congestion, because liposuction needle injection requires multiple injections, so it is generally injected in the form of a needle. Due to many injection points and small scope, it is easy to cause wound congestion. 4, pain, almost every patient will feel, but everyone's tolerance for pain is different, usually three weeks to a month before the pain disappears.