Redness and pain at the nostrils indicate local inflammation. This is often related to repeatedly picking the nostrils with your fingers or blowing your nose hard when you have a cold, because there are more bacteria on your fingers and in your nostrils, which can easily cause nostril infection after contacting your nostrils, and anti-inflammatory treatment is recommended. Firstly, the exudate at the nostril should be cleaned with a cotton swab dipped in saline. Secondly, to wet compress Levanox gauze in the red and swollen position, each wet compress for 20 minutes, twice a day, the gauze plays the role of local anti-inflammatory and swelling. Finally, apply erythromycin ointment or mupirocin ointment to the red and swollen nostril to play an anti-inflammatory role, also twice a day. Do not touch your nostrils with your fingers, do not eat spicy and irritating food, and get plenty of rest.