My 15mo is always snotty, and the amount of snot that comes out of him is truly incredible. At its worst first thing, but carries on all through the day. I have to use muslin cloths (and a ridiculous number thereof each day) to wipe him - there's too much snot for tissues.
I'm starting to wonder if he's allergic to something. I've been giving him Piriton for a few days, but it as made no difference.
He is allergic to penicillin and gets lots of rashes on his back (that don't bother him but look odd). GP, rather unhelpfully, says of the rashes he is just one of those babies who is allergic to things.
His older brother is dairy intolerant (but seems to be growing out of it) but never had the snot problem.