Bed bugs are small, wingless insects that feed exclusively on blood, typically biting people at night while they sleep. About the size and shape of an apple seed, they’ve become increasingly common in homes, hotels, and apartments worldwide. Here’s what you need to know to identify them, spot an infestation early, and get rid of them.
What Bed Bugs Look Like
Adult bed bugs are roughly 3/16 of an inch long, reddish-brown, and extremely flat when unfed. Think of a flat, oval disc about the size and color of an apple seed. After feeding, their bodies balloon out into an elongated torpedo shape and turn bright red. They have thin legs and antennae but no wings, so they can’t fly or jump.
Immature bed bugs, called nymphs, go through five growth stages before reaching adulthood. Unfed nymphs are nearly translucent, pale white or yellowish, making them harder to spot. Once a nymph feeds, it plumps up and turns brilliant red, resembling a tiny raspberry seed. At each stage, the nymph sheds its skin, leaving behind an empty shell that looks like a smaller, translucent version of the bug itself.
Bed bug eggs are pearl-white, about the size of a pinhead. After five days, tiny dark eyespots become visible on older eggs. Both eggs and nymphs are visible to the naked eye, but you’ll need good lighting and close inspection to find them.
Signs of an Infestation
You’re unlikely to catch bed bugs in the act of feeding. Instead, look for the evidence they leave behind. The most reliable signs are fecal spots, molted skins, and live bug clusters found in specific hiding places.
Fecal spots are small, black dots (not red, because the blood has already been digested). They come out as a semi-liquid and dry with a smooth texture on surfaces. You’ll often find them in groups of ten or more along mattress seams, on box spring frames, behind headboards, along baseboards, near electrical outlets, and in curtain folds near the rod. These spots are one of the earliest and most common indicators of bed bug activity.
Molted skins accumulate in the same areas where bed bugs hide. Check along mattress seams, behind headboards, at ceiling and wall junctions, along baseboards, and on personal belongings stored near the bed. The skins look like empty, translucent shells in the shape of a bed bug, and they vary in size depending on which growth stage shed them.
When an infestation is established, bed bugs gather in clusters that contain live bugs at multiple life stages, fecal spots, cast skins, and both hatched and unhatched eggs. These aggregations tend to form along mattress seams and tufts, under mattress tags, inside screw holes in bed frames, where box spring fabric is stapled to the wood frame, and behind headboards. A lint roller run along bedding and mattress surfaces can pick up tiny nymphs or eggs you might otherwise miss.
How Bed Bug Bites Present
Bed bug bites typically appear as inflamed spots, often with a darker dot in the center, arranged in a rough line or cluster. They’re most common on the face, neck, arms, and hands, which are the areas most likely to be exposed during sleep. The bites are itchy, and some people develop an allergic reaction that can include blisters or hives.
Not everyone reacts to bed bug bites. Some people show no visible marks at all, which is one reason infestations can go unnoticed for weeks. For those who do react, bites usually clear up without treatment in one to two weeks. Bed bugs do not transmit disease. The primary health concern is the skin irritation itself and, in some cases, secondary infection from scratching.
How to Inspect a Hotel Room
When you arrive at a hotel, leave your luggage in the bathroom or bathtub before doing anything else. Bed bugs rarely hide in bathroom areas, so your bags are safer there while you check the room. Bring a small flashlight if you can, or use your phone’s light.
Strip the bed completely. Inspect the mattress seams, tags, and corners with your light, looking for live bugs, fecal spots, or shed skins. Lift the mattress and check the box spring the same way, paying attention to the wooden frame. Examine the bed frame’s joints and crevices, especially the headboard and footboard. Then move to upholstered furniture: remove cushions, check seams and zippers. Look behind wall hangings and mirrors, inspect curtain folds and hems, check the edges of carpets near the bed, and glance at baseboards and electrical outlets.
If the room looks clean, you can unpack. If you find anything suspicious, request a different room, ideally not adjacent to or directly above or below the original one.
Getting Rid of Bed Bugs
Integrated pest management, or IPM, is the most effective approach. It combines non-chemical methods with targeted pesticide use only when necessary, minimizing health risks while maximizing results.
Heat is one of the most reliable tools. Bed bugs die after 90 minutes of constant exposure to 113°F, or within 20 minutes at 118°F. Eggs are harder to kill: they require 118°F sustained for a full 90 minutes to reach complete mortality. Professional heat treatments raise the temperature of an entire room to lethal levels. For clothing and smaller items, a household dryer on high heat is effective.
Mattress and box spring encasements are a key part of both treatment and prevention. These sealed covers trap any bed bugs already inside, cutting them off from food until they die. They also eliminate the cracks and seams where bed bugs prefer to hide, making future detection much easier. For an encasement to work, it must cover the entire mattress or box spring, seal completely with no gaps at the zipper, and have zipper teeth small enough that even tiny nymphs can’t squeeze through. Once installed, leave the encasement in place and check it every few months for rips or worn spots.
A biopesticide called Aprehend has shown strong results against bed bugs. It’s non-toxic to humans and other mammals, kills bed bugs within about three weeks of exposure, and remains active for up to three months. Dust-based insecticides should not be applied to mattresses or used as surface treatments because they irritate the skin and lungs. Any chemical treatment beyond basic measures should be handled by a licensed pest control professional with bed bug experience.
Prevention at Home
Avoid bringing used furniture or mattresses into your home unless you can inspect them thoroughly. Bed bugs travel easily in secondhand items, and an infestation can establish itself quickly once a few bugs are introduced.
Reduce clutter in bedrooms. Every pile of clothing or stack of papers gives bed bugs another place to hide and makes inspection harder. Store belongings in clear plastic bins with snap-on lids, which are easy to move and inspect. Keep dirty laundry in hampers rather than on the floor, and vacuum frequently, especially around beds and furniture.
Use solid, light-colored sheets. Bed bugs and their fecal spots are much easier to see against a pale, unpatterned background. Pull your bed a few inches away from the wall and make sure no bedding drapes to the floor. You can create a physical barrier by spreading a thick band of petroleum jelly, at least two inches wide, around each bed leg about six inches off the floor. Bed bugs cannot crawl through it. Sealing cracks and crevices in walls, baseboards, and around outlets also limits the routes bed bugs use to travel between rooms or units in multi-family buildings.