@carliann - Welcome to Mayo Connect! Sores in the nose is not that common- therefore confusing.
It could be an bacterial infection that children often get around mouth and face- strep or staph. It could also be viral of course. There could be an associated sore throat.
Your first step would be to go to your primary care physician for an exam of the sores. If no diagnosis is found you should see an ENT specialist.
Please follow up with us!