DS (2.8) told me a cheerio was stuck up his nose. I hadn't seen him put one up there and thought he knew better, but obviously he didn't!
When I looked using a torch, there is was!
Before I panicked and phoned the Dr or hospital, I phoned his nan. She told me to see if he could blow it out himself. On the 2nd attempt it worked. Then I told him off so hopefully he won't pull a stunt like that again. My DD has never done anything like that. Hope she doesn't copy him!