We're trying to figure out the cause of a lump that has appeared above the beak of our 5-year old Silkie mix. We noticed it a few days ago. It seems pretty solid (not squishy), is dark with white spots, is not hot, and there's no bad smells coming from her mouth area. She doesn't seem bothered by it -- is eating, drinking, and pooping normally. We're trying to figure out if we should take her to a vet for treatment, or just let it run its course -- any advice would be greatly appreciated!