Near a window or door
Exterior entry and weather stripping may be the more likely path.
Pattern: humid room
Why earwigs turn up in bathrooms
Bathrooms offer humidity, protected edges and openings around pipes. An earwig may simply wander into that environment; repeated sightings around one fixture deserve a more focused check.
Check the location, not just the room
Under a sink
Look for droplets, damp cabinet material, staining and gaps around supply or drain lines.
Beside a tub or toilet
Note recurring moisture, failed sealant or activity concentrated around a penetration.
Only after showers
Ventilation and ordinary humidity may explain why the room remains attractive.
What you can safely do now
- Dry visible moisture and see whether sightings stop.
- Run the exhaust fan during and after bathing.
- Check accessible plumbing and cabinet surfaces for dampness.
- Record where and when additional insects appear.
An earwig does not prove a hidden leak. Persistent moisture, staining, swelling, or a musty odor are separate reasons to investigate.