Bed Bug Bites, or Something Else?

Skin reactions are not a reliable way to identify bed bugs, in either direction. People react very differently to the same bites, and a significant proportion of people show no visible reaction at all. Two people sleeping in the same bed can wake up with completely different evidence.

Reactions also take time to appear, sometimes days, so the marks you find in the morning may not correspond to where you were when they happened.

In the other direction, plenty of things produce marks that people reasonably assume are bed bugs. Fleas, mosquitoes, mites, contact reactions to detergents or fabrics, and various skin conditions all get mistaken for them. A doctor or nurse practitioner is the right person to ask about a skin reaction. We are not, and neither is a pest control salesperson.

Physical evidence in the room is far more reliable than evidence on skin. Start with the bed, because that is where the population concentrates.

Check the seams and piping of the mattress, the box spring, the frame joints, and the underside and back of the headboard. Look for small dark spots that look like ink dots on fabric, which is digested blood, along with pale shed skins and, in established infestations, live insects roughly the size and colour of an apple seed.

Then work outward. Upholstered seating, the seams of chairs and sofas, the underside of nightstands, behind picture frames, along baseboards, and in the joints of any wooden furniture near where people sleep.

Very little, which is the honest answer. A visual search finds bed bugs once there are enough of them to find. Early infestations sit in seams and voids in numbers too small to spot, and the people who are best at finding them are the ones who look at hundreds of rooms a year.

This is the specific gap canine detection fills. A dog works from scent, which is present at levels well below what is visible, including from eggs. That is why a room can look completely clear to a careful person and still be positive.

When you are about to spend money. Treatment costs considerably more than an inspection, and treating on suspicion means you may pay for a problem you do not have and still not know whether you have it.

When someone else disputes it. If you are a tenant and your landlord says there is nothing there, or a landlord and your tenant says there is, a documented third party finding replaces an argument with a record.

When it matters that you are certain. Before moving furniture into a new home, before a resident moves into a retirement suite, after a stay somewhere you are worried about, or after treatment when you need to know it worked.