It may be due to a nose boil that is growth in the nostril. It is irritating but it can be easily treated with the combination of
1. An antibiotic such as Augmentine 1g twice a day for 05 days.
2. An analgesic
such as Mefenamic acid
thrice a day.
3. Decongestant such as combination of Loratidine
It will respond in 02 to 03 days so donot worrry.
I hope I am sucessful in solving your query if you have more you can ask me.
Dr. Azhar Sattar