My bf took our son to the doctors because it s been two weeks since his breathe or nose smells like cheese , & before it started to smell like that , he had a sore under his nose which I thought was a cold sore and I thought that was where the smell was coming from but the sore is gone , and he still smells so bad , it s terrible , anyways I guess the doctor just gave him so pennisilyn to see if maybe it s an infection in his throat , cuz he has been sick for a bit now .
HI....nose smelling bad suddenly could be because of 2 reasons.1. An intro dermal boil of infection of the subcutaneous or mucosa of the nose.2. A forgotten foreign body and this might be the sides for infection and bad odor. I suggest you take him to an ENT surgeon and get a rhinos copy done and then let him decide what to do. Regards -