Just keep an eye on him for now hun

Make sure he is eating and drinking adequatly, toileting normally, not showing any signs of inflammation around the eyes nose or throat. If he shows any of those, or becomes very lethargic or appears to be in pain then its off to the vets.

Its more than likely he got a crumb of food on his nose, or has sniffed in some dust or something thats just irritated the area a little bit. But your right it just needs keeping an eye on.