DS1 (2.5yrs) has had a snotty nose for like months now. I can't even work out how long. I remember saying that I hoped the warmer weather would clear it up, so that sort of implies it started back in winter

For the last while, maybe a month or so, it has been really nasty snot - thick and yellow/green. It drips all day. Dries off overnight and starts again the next day.

Apart from that, he doesn't seem sick. Tantrums, but hey he's 2.5, so that's par for the course!

Does this sound like something that should be checked out?