Bed bugs are small, flat, wingless insects that are usually about the size of an apple seed and visible to the naked eye.

What adult bed bugs look like

  • Shape: Oval and very flat from top to bottom, a bit like a tiny brown lentil when unfed.
  • Size: About 4–5 mm long (roughly an apple seed), and 1.5–3 mm wide.
  • Color (unfed): Light to medium brown or reddish‑brown.
  • Color (after feeding): Darker red‑brown, and the body looks more swollen and elongated because it is filled with blood.
  • Wings: They have tiny wing pads but no functional wings, so they cannot fly.
  • Legs and antennae: Six legs, with two short antennae at the front of the head.

Quick visual cue

If you see a flat, apple‑seed‑sized, reddish‑brown bug crawling near a mattress seam, headboard, or bed frame, that’s very typical of an adult bed bug.

What baby bed bugs (nymphs) look like

  • Size: Much smaller than adults, starting around 1–1.5 mm when newly hatched (about the size of a pinhead).
  • Color (unfed): Very pale, almost clear or whitish‑yellow, which makes them harder to spot on light bedding.
  • Color (after feeding): Their abdomen can look bright red or dark because you can see the blood through the clear body.
  • Shape: Same basic oval, flat body shape as adults, just miniature.

As nymphs grow, they shed their skin several times, leaving behind empty, pale, shell‑like casings.

What bed bug eggs and shells look like

  • Eggs:
    • Tiny, about 1 mm long.
* White to pale cream, and slightly sticky so they can adhere to surfaces.

* Often found in clusters in crevices, mattress seams, or joints of furniture.
  • Shed skins (casings):
    • Translucent, beige to pale yellow “shells” shaped like a bed bug but hollow.
* Range in size from very small (young nymphs) to almost adult size.

* Commonly found around mattress seams, headboards, or other hiding places.

Signs that go with what they look like

Even if you don’t see the actual bugs, you might see what they leave behind.

  • Tiny dark spots:
    • Black or very dark brown dots (bed bug feces), about the size of a pen dot, sometimes smeared like marker ink on fabric.
  • Reddish stains:
    • Rusty or reddish smears on sheets or mattress where bugs were crushed.
  • Bites on skin:
    • Itchy red bumps often on exposed skin (face, neck, arms, hands) while sleeping, sometimes in a line or cluster.

Mini FAQ: “Is this a bed bug or something else?”

Many people confuse bed bugs with other insects like carpet beetles, small roaches, or fleas.

  • Not a flea: Fleas are thinner side‑to‑side and can jump; bed bugs are flatter top‑to‑bottom and do not jump or fly.
  • Not a tick: Ticks have a more rounded body and different head shape, and are more often found attached to skin after outdoor exposure.
  • Not an ant: Ants have a narrow “waist” and elbowed antennae; bed bugs are more uniformly oval without a pinched waist.

If you’re unsure, collecting a sample in a clear tape or small container and having a pest professional or health service identify it is usually recommended.

Bottom note: Information gathered from public forums or data available on the internet and portrayed here.