A Black Spot on a Spayed Dog's Vulva
A flat dark spot on the vulva is often just pigment. Licking or irritation can darken skin in that area. The extra licking is worth paying attention to, though, because licking in spayed females is often caused by vaginitis, a urinary infection or skin-fold infection around the vulva.
Ask your vet to check the area and her urine. Have the spot checked sooner if it's raised, grows, bleeds, or changes color or shape, or if you notice discharge, a bad smell or frequent urination.
This is general information, not a diagnosis. Please follow your own vet's advice.
