A house centipede bite typically appears as a small red, swollen area with two tiny puncture marks close together, often forming a V or chevron shape. Most house centipedes are small enough that their bites look similar to a minor bee sting or mosquito bite, and many can’t even break human skin at all.
What the Bite Looks Like Up Close
The most distinctive feature of any centipede bite is the pair of puncture marks. Centipedes don’t actually bite with a mouth. Instead, they use forcipules, which are modified front legs that work like pincers to pierce the skin and inject venom. Because these pincers come in a pair, they leave two small marks arranged in a chevron or V shape rather than a single puncture point.
Around those marks, you’ll typically see redness and swelling. The skin may look puffy and inflamed in a circle roughly the size of a dime to a quarter, depending on your reaction. Some people notice a small amount of bleeding from the puncture sites. In uncommon cases, a fluid-filled blister can form at or near the wound. The surrounding skin may feel warm to the touch and appear slightly hardened.
That said, house centipedes are small, usually under three inches long, and their forcipules are proportionally tiny. Many house centipedes simply can’t generate enough force to puncture human skin. When they do break through, the marks are often so small they’re hard to distinguish from a scratch or minor bug bite. You may not even see two clear puncture points.
How It Feels
The initial sensation is a sharp, sudden sting, similar to a bee sting but often milder. Pain can range from barely noticeable to moderately intense depending on the size of the centipede and where on your body it got you. After the initial sting, you may feel burning, itching, throbbing, or a dull lingering ache at the site. Some people report tingling or numbness around the wound.
For most house centipede bites, the pain and swelling peak within the first few hours and fade within one to two days. The redness may linger slightly longer. Larger tropical centipede species cause far more severe reactions, but the common house centipede found in basements and bathrooms across North America produces mild symptoms that resolve on their own.
How It Differs From Spider Bites and Stings
The twin puncture marks are the clearest giveaway. A bee sting leaves a single puncture (sometimes with a stinger still embedded), while a mosquito bite is a raised, round welt with no visible puncture at all. Spider bites can also leave two fang marks, which makes them the easiest to confuse with a centipede bite. The difference is context: if you felt something skitter quickly across your skin before a sharp sting, that’s classic centipede behavior. Spiders tend to bite when pressed against the body, like inside clothing or bedding.
Another clue is the pattern of marks on your skin. When a house centipede runs across you, its many tiny sharp legs can leave a trail of small pinpricks or light scratches along its path. These scratch lines near the bite site are unique to centipedes and won’t appear with spider or insect bites.
How Often House Centipedes Actually Bite
Rarely. House centipedes are shy, fast-moving creatures that strongly prefer to flee rather than fight. They hunt other insects like spiders, cockroaches, and silverfish, and they have no interest in biting people. Bites almost always happen accidentally, like when you roll onto one in bed, step on one barefoot, or reach into a dark space where one is hiding. If you encounter a house centipede on a wall or floor, it will almost certainly sprint away from you.
Because they’re nocturnal, most encounters happen at night in damp areas like basements, bathrooms, and laundry rooms. Turning on a light before walking through these spaces barefoot reduces your chances of an accidental encounter.
Basic First Aid
Wash the bite with soap and warm water. Apply a cold pack or ice wrapped in a cloth for 10 to 15 minutes to reduce swelling. An over-the-counter antihistamine can help with itching, and a standard pain reliever can manage discomfort. Keep the area clean and avoid scratching, which can introduce bacteria into the puncture wounds.
Signs of a More Serious Reaction
Complications from house centipede bites are extremely rare, but they’re worth knowing about. Watch for a red streak extending outward from the bite site, which can signal that the lymphatic system is reacting or that a secondary infection is developing. Increasing pain, warmth, or pus around the wound after the first day or two suggests bacterial infection rather than normal healing.
In very rare cases, people experience an allergic reaction to centipede venom. Swelling that spreads well beyond the bite site, difficulty breathing, or dizziness after a bite are signs of a systemic allergic response that needs immediate medical attention. This is far more commonly associated with large tropical centipede species than with the small house centipedes found indoors, but individual sensitivity varies.