Finding a strange bug near your bed is unsettling—but it does not automatically mean you have bed bugs. Bed bugs are small, flat, wingless, reddish-brown insects that feed on blood at night, and the most reliable confirmation is finding the insect itself or clear evidence around your sleeping area—not just bites.

This guide covers seven signs of bed bugs, the bugs most often mistaken for them, and practical Amazon products that can help with detection and control.

What a bed bug looks like

An adult bed bug is usually 5–7 mm long—about the size of an apple seed—with a flat, oval, reddish-brown body, six legs, short antennae, and no wings. After feeding, it becomes swollen, darker, and more elongated.

Nymphs are much smaller and can be nearly colorless or pale yellow before they feed. Bed bugs cannot fly or jump; they crawl quickly and hide in cracks, seams, and dark crevices near where people sleep.

7 signs it may be bed bugs

1. You find the actual bug

The strongest evidence is a live bed bug or intact shed skin. Check mattress seams, box-spring edges, bed-frame joints, headboards, behind pictures, and along baseboards.

If you find one, avoid crushing it. Place it in a sealed bag or lift it onto clear tape, then photograph it from above and the side for identification.

2. Rusty or dark fecal spots

Bed bug droppings appear as tiny dark brown, black, or rusty spots on sheets, mattresses, box springs, and nearby furniture. These spots are digested blood and may smear like ink when wiped with a damp cloth.

3. Blood stains on bedding

Small rust-colored blood spots can appear on sheets or pillowcases after a bed bug is crushed during or after feeding. This is a warning sign, but blood stains alone are not proof of bed bugs.

4. Shed skins and eggs

As nymphs grow, they molt and leave behind pale, translucent exoskeletons. You may also find tiny, pinhead-sized white eggs or eggshells tucked into mattress seams, furniture joints, and cracks.

5. Bites in a line or cluster

Bed bug bites often appear as itchy red welts on exposed skin such as the face, neck, arms, or hands after sleeping. However, bite reactions vary widely, and many other insects or skin conditions can cause similar marks—so bites alone cannot confirm an infestation.

6. A sweet, musty odor

In a heavier infestation, bed bugs can produce a distinct sweet, musty smell. This is useful supporting evidence, but you should still inspect for live bugs, fecal spots, skins, or eggs before treating.

7. Bugs or evidence near where you sleep

Bed bugs tend to stay close to their host. Look carefully at mattress tufts and piping, box springs, bed frames, headboards, couch seams, electrical outlets, wallpaper edges, and floorboard cracks.