I had a sore/tender nose last year, only hurt when I touched it and woke up with it one morning, no trauma to it at all, felt a little unwell, phoned out of hours surgery as was concerned, went to see the doctor and turned out to be facial cellulitis, had I left it over weekend I would've ended up on IV antibiotics in hospital!!! If you've not bumped it and there is no spot inside please get it checked out just in case.