Disgusting title I know! Sorry!
Dd (coming up to 4) has had a cold on and off for a month at least - not a bad cold as such, but a persistent one.
I have recently noticed that the gunk up her nose smells of fish, which is disgusting. The gunk itself is yellowy/green.
I tried flushing out her nose with some special sea water spray and got a lot of the muck out, but it still smells fishy. Do you think it could be infected?