Bed bugs adults are reddish-brown, oval, flattened insects from 6 to 9 mm long and 1.5 to 3 mm wide before feeding. Engorged (blood-fed) adults are swollen and dull red. Though wingless, adult bed bugs do have small wing pads. The eyes are deeply pigmented and the sides of the collar-like pronotum curve slightly around the head. The nymphs (immatures) resemble the adult though they are smaller in size. Newly hatched nymphs are almost colorless whereas engorged nymphs are reddish and swollen Bed bug eggs are white, oval egg is about 1 mm long.
Humans are the preferred host for Bed Bugs. Bed bugs do not bore into the skin. Our major concern is more towards their feeding. They insert their mouthparts into the host's skin and suck out blood. As bed bugs feed, they inject saliva which may produces an allergic reaction that often causes slightly delayed swelling, itching, and irritation that can persist for a week or more.Bed bugs also emit a noticeable odor.