I noticed last night that my hedgehog has developed a red bump above his upper lip. It looks like it might be due to an ingrown hair or infected whisker follicle. I am trying to get a vet appointment but, in the meantime, thought I'd ask here if anyone has seen something like this before. He has lost two teeth over the past 6 months, which I attributed to aging (almost 4 years). I'm now worried the bump might be related, although the inside of his mouth looks fine (no bumps or irritations) from the fleeting glimpses that he's allowed.
I know the picture I've attached isn't the clearest, but Vladimir doesn't like to sit still or pose for photos.