Tiny black “spots” I first saw outside by doors and then inside. I thought they were seeds. Then I thought they were droppings. I put down a glue board and the specks are on the board. No larger critter, so the specks themselves are the culprits. They show up by baseboards, but I see occasionally on walls and door frame. They are not bothersome but I’d like to know what they are and do I need to rid myself of them. They are more or less the size of coffee grounds.