[Amethyst_ice]

Sables can be quite dark black/brown but they rust with age and as the hair thins it can also fade down the root shaft. The eye rings are a big tell tale and the banding (the splogdy whitte bits) can pattern the ears.

Im pretty confident it is just skin pigments and nothing to worry about but obviously if you are worried a vet trip wouldnt harm

They can rub faces between bars or on certain areas or overgroom areas that can wear away little patches too