This is the best picture I could get. It looks like dirt and there's lines of my actual skin color showing through, but I've tried washing it off and exfoliating it off, but it doesn't come off. It appeared a couple of days ago. It doesn't bother me, it doesn't itch, it's just kind of there. I've never had something like this during my whole pregnancy or before I became pregnant and it's not anywhere else. It's just on my right arm.