There are several main hazards to remember when picking your nose.

The nose is the gateway of human respiratory tract. ① There are abundant capillaries in the nasal cavity, which secrete viscous liquid, cool the air and moisten the air. (2) The nose hair is criss-crossed, such as a protective barrier to filter the heavy dust impurities in the inhaled air. The normal function of nose is directly related to the health of respiratory tract. Bad nose digging habits often lead to atrophic rhinitis. Due to the atrophy of nasal mucosa, the secretion is reduced, and the nasal defense ability is reduced or lost, which leads to a series of respiratory diseases, such as chronic pharyngitis, chronic tracheitis, sinusitis, and even diseases that are prone to secondary lung infection. There is a very thin mucosa in the nasal cavity of human body, and there are very rich capillaries under it. If you often pick your nostrils, the capillaries will be damaged and bleed. There are many nose hairs in the anterior nasal cavity, forming a "protective forest" to prevent dust and bacteria mixed in the air from entering the lungs. Digging nose excrement often removes nose hair, which makes the nasal cavity become the portal of microbial invasion and can also cause anterior nasal cavity infection. In severe cases, it can cause intracranial purulent infection, because the veins in the nasal cavity are connected with those in the cranial cavity. Therefore, the "danger triangle" centered on the nose must not act rashly. If you catch a cold and have a lot of nasal secretions, you can wet the mucosa with a cotton swab and then gently pull out the dry scab. Don't pick your nose casually to avoid bleeding and infection. When the normal nostril is stimulated by polluted air or the air is dry, it will also cause the nostril to itch and dry, but it is not advisable to pick the nostril with your fingers. It's not good to get into the habit of picking your nose to stop itching. Because there are many nose hairs in the nostrils, these nose hairs are interwoven into a mesh, which can block the dust, particles, bacteria and other unclean things in the inhaled air, and play a role in cleaning the inhaled air and protecting the respiratory tract. In addition, the front of the nostril is protected by skin, and bacteria cannot invade. If you often pick your nostrils with your fingers, hard nails will damage the skin in your nostrils and cause infection. Even if there is no infection, the broken skin will scab after healing. It's hard to get scabs in the nostrils, so I always want to pick them with my fingers, so there will be a long-term unhealed situation. When the scab in the nose feels uncomfortable, be patient and refrain from picking your nose with your fingers. In this way, after a few days, the wound will heal, the scab will fall off, and the uncomfortable feeling will disappear. If the scab surface is too large and the nasal itching is unbearable, you can apply some ointment or zinc oxide oil to soften the scab skin and relieve the nasal itching. Some people think it doesn't matter if you don't dig your nose as long as you pay attention. No, sometimes even if you don't feel pain, you will often get a slight scratch, which will destroy the normal protective function of the skin and open a channel for the invasion of bacteria, which will lead to infection and boils. Once there is a boil in the nostril, it is not only very painful, but also the inflammation in this part is easy to expand. If the treatment is not timely, the inflammation will spread, which will be life-threatening. Because this area is easy to cause danger, it is called the danger triangle in medicine. Therefore, you must not get into the habit of picking your nose. In addition, plucking nose hair can cause the same harm as picking nostrils. People who have the habit of picking their nostrils and plucking their nose hair should get rid of this bad habit.