Many people know the term “danger triangle” of the face, but not many non-medical professionals really understand what it means, and this is evident from their conversations. This is because when they have a lesion in this area and the doctor recommends surgery to remove it, the first thing most people say is “no, it’s in the ‘danger triangle’, you can’t do surgery”. In fact, the “danger triangle” is not a forbidden area for surgery. 1, the location of the “danger triangle” facial “danger triangle” is an isosceles triangle with the root of the nasal bridge as the apex and the line of the two corners of the mouth as the bottom. It includes the upper and lower lips, the nose and the sides of the nose and other major facial organs. In addition to this small triangle, the human face has a large “triangle”, which is a large “inverted triangle”, from the eyes to the lips of the large triangle. 2, “Dangerous Triangle” why dangerous “Dangerous Triangle” is dangerous because the blood supply in this area is particularly rich. The key point is that the veins in the “danger triangle” of the face lack the “valve” that prevents blood reflux – the valve. The venous valve is an important part of our body’s blood vessels. It is very thin, soft, and very transparent. The only function of the valve is to act as a one-way “valve” to ensure that blood flows in the direction of the heart in the veins. If there are no valves or if they are not functioning, the blood will flow backwards and cause reflux disease. This is a common cause of varicose veins in the lower extremities. The veins of the face are connected to the veins of the skull. Normally, the venous blood from the face flows back downward into the heart, but because there are no venous valves, when the downward returning vessels are not open or are locally squeezed, the blood can flow backward upward into the skull. When inflammation occurs in the face, especially when the inflammation is in this triangle, it may spread the facial inflammation to the skull and produce intracranial infection. 3, “dangerous triangle” how to grow things “dangerous triangle” although dangerous, but is not a surgical no-go area. Because of the abundance of sebaceous glands on the face, sebaceous cysts, boils and other lesions often appear, and the right thing to do is to let nature take its course. Sebaceous cysts do not absorb on their own and require surgical removal. Since the surgeries are performed in a sterile manner, there is no need to worry about the ill effects of intracranial infection that may occur as a result. In the case of infectious lesions such as boils, antibiotics should be administered in a timely manner and the lesions should be allowed to subside and absorb naturally, with incision and drainage if necessary. If there is a pigmented mole or other mass in the “danger triangle”, it is safer to remove it surgically, because the surgery itself is sterile and there is almost no possibility of infection, so there is no danger! If there is an infection in the “danger triangle” of the face, followed by eyelid edema, or conjunctival bruising, protrusion of the eyeball, limited abduction, ptosis or even visual impairment, and generalized chills, fever, headache, etc., this indicates an intracranial infection and prompt hospitalization.