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The reason he called the nose and the upper lips the "triangle of death" is because when we touch that area, usually with fingers that have been exposed to pathogens such as viruses and bacteria from normal, everyday surfaces and contacts, these pathogens have access to the brain because the veins that drain blood from this part of the face, drain the blood to the brain before it gets back to the heart. That provides the access route for potentially serious infectious pathogens to cause some potentially very serious infections. Does that make sense?
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My opinion is solely informative and does not constitute a formal medical opinion or recommendation. For a formal medical opinion and/or recommendation you must see an eye doctor.