The blood supply in this area of facial triangle is particularly rich, and the venous blood vessels lack valves to prevent blood from flowing back. Veins in the face are connected with intracranial veins. Under normal circumstances, venous blood from the face flows back to the heart. However, because there is no venous valve, blood can flow back to the brain when the returned blood vessels are blocked or partially squeezed.
After infection (such as furuncle, carbuncle, etc.). ) occurs in this area, if you scratch, squeeze, stab, hot compress or accidentally injure it, it will easily lead to the rapid spread of inflammation and cause thrombophlebitis of intracranial cavernous sinus, which can be life-threatening in severe cases.
Extended data:
The "danger triangle" refers to the area under the nose and around the mouth. This part of the blood vessels is rich, and infections in oral cavity, nose, throat, eyes and other parts can extend here. The most serious thing is that there are many blood vessels leading to the brain in this place. Once they are damaged or infected, they will spread bacteria and their toxins to the brain, leading to meningitis or brain abscess.
Therefore, the boils in this part, even small boils, should never be squeezed by hand, which will cause the spread of infection. It was originally a trivial boil, and there were many examples of meningitis and even death due to extrusion.
References:
People's Network-People with boils can't squeeze? Can I touch the facial triangle?