Bed bug eggs are very small, roughly 1 millimeter long, and white to pearl-white in color. They are shaped like elongated ovals resembling tiny grains of rice and have a hinged "cap" at one end. If the eggs are more than five days old, they will have a conspicuous dark mark on them that resembles an eye. Bed bug eggs can be found as single eggs or in clusters, and they are usually laid on mattress seams and joints, but its also common to find them on the box spring and behind the headboard, if it butts up to or is attached to the wall. Grouping these tiny eggs together can make it easier to detect their presence before they hatch, usually within seven to 10 days. Bed bug eggs are notoriously difficult to come across due to their translucent appearance and small size, so you might need a flashlight and a magnifying glass to find them.