Things up the nose (XP)

DD has started to constantly put her finger in her nose.  It seems to be only one nostril though, so I'm worried she's put something up there and it's stuck or maybe she's got some irritation in her nose. there's no bump, and we can't see anything with a flashlight.  She doesn't seem to have any breathing problems either, and of course she won't let me touch her nose to see if anything is clogged. 

it could very well be that she's 1 and realized she has a hole in her nose and likes to just stick her finger up there, so I'm trying not to overreact.  Plus last night in the tub she kept putting her finger in her sister's ear.  Clearly this is new and exciting, so it may just be that.  Plus she's not really around anything small - ever. I'm thinking if anything it's food or dirt.

Anyone else experience something stuck up their LO's nose?  What were the signs? Are your LO's constantly putting their fingers up their noses too? I don't remember this with DD1.