My 1-year-old male Sphynx cat has what look like symmetrical grey ulcerations on his bottom gums, just behind where his upper canines align with his lower jaw. Is his orthodontia damaging the tissue of his gums? He eats and drinks normally and seems to be generally happy and healthy.
We also own his younger sister (same parents, different litter), who is ~4 months old. She has similar protrusions in her lower gumline that are a lighter color, which makes me alternatively wonder if these are normal-looking submandibular glands in the Sphynx breed that naturally darken over time.