Human flea vs Chigoe flea
These two are easy to mix up. Here's how to tell a human flea from a chigoe flea, and whether either one bites or stings.
Human flea
Pulex irritans
Chigoe flea
Tunga penetrans
≠The key differences
Pulex irritans does not burrow into the skin; it is a free-living, blood-feeding flea and appears as a small flattened jumping flea rather than an embedded nodule.
⚖︎Side by side
| Human flea | Chigoe flea | |
|---|---|---|
| To humans | Biting pest | Burrowing parasite |
| Size | 1.5-3.0 mm long | About 1 mm (males and unengorged females), up to 8-10 mm when embedded and gravid |
| Colours | Dark brown, Blackish brown | Dark brown, Pale yellow, Cream/white (engorged female nodule) |
| Family | Pulicidae | Tungidae |
| Habitat | Human dwellings, animal resting areas, nests and burrows; larvae develop in carpets, bedding, cracks in floors, soil and detritus near hosts | Sandy, dry soils near homes, animal resting areas, beaches and dusty paths in tropical and subtropical regions |
| Range | Cosmopolitan; recorded worldwide in association with humans and a variety of mammals | Native to Central and South America; now widespread in sub-Saharan Africa, the Caribbean and parts of Asia where warm sandy habitats occur |
| Active | Active year-round in heated buildings; outdoors most active in warm months; adults bite any time of day but often feed when hosts are resting | Year-round in tropical areas; activity increases in dry warm conditions when sandy soils are exposed |
| Pest? | Yes | Yes |
🔍How to spot a human flea
- Small (1.5-3.0 mm), wingless and laterally flattened insect that jumps strongly
- Dark brown to black and shiny with backward-directed bristles
- Lacks genal and pronotal combs (rows of spines) that are present on cat and dog fleas (Ctenocephalides spp.)
- Short head compared with some other flea genera
🔍How to spot a chigoe flea
- Look for a small round white to yellowish nodule with a central dark dot (the posterior breathing/egg pore) on the skin, commonly on toes, feet, heels or around nails.
- Lesion is usually painful and itchy and may have surrounding inflammation and secondary infection.
- History of walking barefoot or contact with sandy soil in tropical/subtropical regions increases likelihood.
?Frequently asked questions
What is the difference between a human flea and a chigoe flea?
Pulex irritans does not burrow into the skin; it is a free-living, blood-feeding flea and appears as a small flattened jumping flea rather than an embedded nodule.
Is a human flea or a chigoe flea more dangerous?
Human flea: Biting pest. Chigoe flea: Burrowing parasite. Pulex irritans bites cause itchy, irritating welts and can trigger allergic dermatitis in sensitive people. Female Tunga penetrans burrows into the epidermis causing a painful, itchy lesion (tungiasis).
Identification from photos is never certain: don't handle insects you can't identify, and get medical advice for bites, stings or allergic reactions.