Nasal hair in human nasal cavity can be filtered and cleaned, which can prevent foreign bodies such as dust from entering the respiratory tract with the air. In windy and dry weather, dust particles accumulate in the nasal cavity and it is easy to form nasal scab. I often feel dry and stuffy nose. At this time, it is best not to pick your nose with your fingers, so as not to damage the blood vessels of the nasal mucosa, make it rupture and bleed, and even cause inflammation. If there is a nasal scab, you can hold down one nostril and gently blow it with the other nostril; If the nasal scab is hard, you can order one or two drops of sesame oil or olive oil before blowing. Or add some water to your nose and gently pull it out with cotton fibers.