For this question, you first need to be clear about the location of the danger triangle. The danger triangle is the triangle from the corners of the mouth to the root of the nose, known as the danger triangle of the face. The face is rich in blood circulation and is crisscrossed with blood vessels that run through the facial muscles. The superficial veins are connected to the deep veins and enter directly into the venous cavernous sinus of the skull, and there are no venous valves in the veins of the face to stop the blood from flowing back, so when the muscles contract, the blood can flow back into the skull. The most important feature of this area is the absence of venous valves, which normally ensure the direction of blood flow and are missing in this case. In addition, the blood circulation here can be connected to the intracranial area, and it is very easy to get into the skull to produce infections, and even the risk of life. Therefore, if you have a pimple or boil in the triangle of danger, it is forbidden to squeeze it, otherwise there is a risk of squeezing the infection into the skull and creating more obvious complications. For lipofilling, it can be done, but it needs to be done carefully. If the needle breaks a blood vessel, it is very easy to inject the fat into the blood vessel, and if the injection reaches a certain amount, it may enter the skull and trigger an embolism in the brain, which is a very horrible complication. In fact, in clinical surgery, no matter in which part of the doctor will be careful, for the location and depth of blood vessels, the doctor will also know. For example, fat rhinoplasty, there is a network of veins on the nose, and the veins on the blood vessels go straight to the skull, if in the injection rhinoplasty, a needle into the blood vessels will produce a very big risk. In short, do not think that minimally invasive, injection risk is very small, you can find people who are not doctors to carry out surgery, or even go to the hotel without sanitation, supermarkets to carry out surgery, medical care itself is a matter of life and death, for cosmetic surgery this kind of icing on the cake of surgery, rather than do not do it, but also do not dare to do it wrong.