WebLock Pest Control
All answers

What are the earliest signs of bed bugs?

The earliest signs of bed bugs are bite welts in a straight line of 3, small rust-colored blood spots on sheets, and pale yellow eggshells the size of a poppy seed in mattress seams. Live bugs (reddish-brown, apple-seed sized) appear only in moderate infestations. If you see any of these, inspect headboards, outlet covers, and box-spring seams within 6 feet of your bed.

Bed bug questions·Updated Jun 6, 2026·Written by a licensed PA technician

The 5 earliest indicators

1. Bites in a line of 3. Often called "breakfast, lunch, dinner" pattern. They itch more than mosquito bites and last 4–7 days. They appear on exposed skin overnight. 2. Tiny rust spots on sheets. Crushed bed bugs leave digested-blood spots about the size of a period. 3. Pale yellow eggshells. Look in mattress seams, behind the headboard, in outlet covers within 6 feet of where you sleep. 4. Sweet musty smell in heavily infested rooms — only present in moderate/heavy cases. 5. Live bugs in mattress seams. Adults are reddish-brown, ~1/4 inch (apple-seed sized), flat when hungry. They hide in tight cracks during the day.

What's NOT bed bugs

You're seeing…More likely…
Bite welts but no patternMosquitoes (especially if outdoor exposure)
Single welt on armSpider or flea
Tiny black bugs on windowsillCarpet beetles (eat fabric, not blood)
Small reddish bugs in basementCellar spider babies or springtails
Tiny brown insect in pet beddingFleas

Where bed bugs hide (and what to inspect)

In order of likelihood:

1. Mattress seams + tags (peel back the tag) 2. Box spring frame (especially staples) 3. Headboard joints + behind picture frames 4. Outlet faceplates within 6 feet of the bed 5. Couch / armchair cushion seams 6. Inside dresser drawer joints (if dresser is bedside)

What to do tonight if you suspect them

  • Pull sheets off, inspect mattress and box spring seams with a flashlight
  • DO NOT bomb the room — foggers scatter bed bugs deeper into walls
  • DO NOT throw the mattress out — encasements + treatment save almost every mattress
  • Take 3–5 clear photos of any bugs / eggs you find and call us

We do free, discreet inspections — unmarked vehicle on request. Schedule →

Want a free inspection in your town?

We serve all of Bucks County and Northeast Philadelphia. Most jobs scheduled same week.

Call 445-900-4999