I have a 9 year old chinese crested. I was brushing his teeth tonight and noticed a crusty black residue forming on the outside of one side of his mouth. Upon pulling his lip away I noticed his lip looked swollen and grey/ red. Any ideas? Poor guy is full of health problems so we frequent the vet. He was there 2 weeks ago and has another appt dec 1. Trying to avoid a trip in between if we can for his sake.
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