Join Date: Aug 2003
Location: Saskatchewan, Canada
Those are the openings to the anal sac ducts. Some cats have a bit more of a waxy secretion, so it builds up into a little mound. Two of my cats just have black, flat marks on either side of their anus, whereas my older cat, Levi gets some build up that looks a bit like your picture.
Because of the build up, your cat may have thicker secretion than most which can predispose to anal sac problems. I would just monitor her for scooting, increased licking or biting at her bum. The only sign that Levi would show of anal sac problems was increased crabbyness. He would start swatting at the other cats and growling when his anal sacs were bothering him. Take your kitty in to the vet if she shows any of these signs, and otherwise, just keep an eye on it.