- Bedbugs classically bite 3 in a row.
- New lesions occur if exposure continues
- Pets can harbor fleas
- Mice mice residing inside walls harbor fleas
- Spider nests with hungry babies bite at night.
- Occupational or avocational exposures (e.g. gardening)
- Mosquitos, midges, and sandflies in specific seasons & environs
- Also ask how the patient sleeps (naked, pajamas, just underwear?)