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3.5 yr old male German Shepherd, Kai, with sudden onset of discoloration, swelling and a "floppy lip" acompanied by mild discomfort. No sign of insect bites, cuts or abrasions.

The vet said to observe it for 24 hours before bringing him in, but I'd like to know what might be causing it. Allergy? Bacterial infection? Tooth/gum problem like gingivitis? Poor puppy :(