I've noticed some very small spots of dirt around the rump area, very close to the skin. Its almost looks as if the skin is pitted. It's very hard to see much due to the amount of fur she has. I haven't seen this anywhere else. She mainly an indoor cat but goes in the garden for a play once a day - doesn't go out of the garden. I flea and worm her every few months. The last time was about a month ago. Does this sound like fleas?