If crusts form in the nostrils, there are several conditions to consider: a. In the location of the nostril opening, also called the nasal vestibule if crusts appear, some people may have painful conditions, to be considered as nasal vestibulitis, possibly bacterial infection or fungal infection, you can use anti-inflammatory ointment, such as Bactrim or Polymyxin B to apply locally, and you can use ointments for the treatment of fungi, such as Denide and other ointments, alternating with anti-inflammatory ointments Apply, gradually will gradually get better. Second, crusting in the nasal cavity, crusting in the nasal cavity is mainly considered to be dry mucous membrane or mucous membrane with erosion surface, easily caused by crusting. You can use drugs that lubricate the nasal mucosa, such as compound mint nasal drops or use physiological sea saline to do nasal rinse treatment.