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How to identify it
- The biting larvae are about 1/150 inch across, almost too small to see without a hand lens; they have six legs and are red to yellowish.[1][4][3]
- Adults are not parasitic. In Missouri they are bright red and often seen in lawns or crossing pavement, which is why chiggers are called 'red bugs'.[1]
- Larger red mites seen on patios and lawn furniture are not chiggers and don't bite people.[3]
Look-alikes
| Look-alike | How to tell them apart |
|---|---|
| Red mites on patios and lawn furniture | Much larger and easy to see; they stain clothing when crushed and sometimes wander indoors, but they don't bite people, mammals or birds.[3] |
Where it lives
Researchers report about 248 chigger species from almost every U.S. state. They're most common in damp, brushy, grassy or weedy areas, especially transition zones such as field edges, paths and overgrown lawn margins, and they're patchy, so one spot can be full of them while another a few yards away has none.[6][1][3][4]
Biology and life cycle
Adults overwinter in the soil and lay eggs in damp soil when spring warms; Ohio State says they emerge once temperatures pass 60 F. Larvae climb to the tips of grass blades and wait for a passing host.[1][3]
A larva injects a digestive enzyme, then feeds on dissolved skin through a hardened tube the skin forms around its mouthparts for up to three or four days before dropping off; nymphs and adults eat insect eggs and other small arthropods.[1][3][4]
On people they crawl until stopped by tight clothing, so bites cluster at sock tops, waistbands, bra bands, behind the knees and in the armpits and groin. Most are scratched or washed off long before they finish feeding.[1][3][4]
Missouri has two to three generations a year; in Ohio numbers peak from June through August. They are most active around 77 to 86 F, go inactive below 60 F and avoid surfaces hotter than 99 F, so sun-baked rocks are usually chigger-free.[1][3][4]
Health risk
MedlinePlus says itching usually starts several hours after chiggers attach and that antihistamines and corticosteroid creams or lotions may help; antibiotics are needed only if the skin becomes infected. Some chigger species elsewhere in the world spread scrub typhus. In the United States, researchers have detected scrub typhus bacteria (Orientia) in chiggers collected in North Carolina and say the role chiggers play in U.S. disease transmission is understudied.[2][6][7]
Control
Prevention
Wear long pants tucked into boots and tightly woven fabrics, and use a DEET or picaridin repellent on clothing from the feet up, reapplying every two to three hours. Permethrin clothing treatments also work against chiggers.[1][5][3]
After being in chigger habitat, take a warm shower and scrub the skin within an hour or two, and wash clothes on a hot setting before wearing them again.[1][3]
Sanitation
Keep lawns mowed and remove unneeded brush and weeds; more sun and air flow make the yard less suitable. Missouri Extension calls this the most effective form of area control.[1][3]
Pesticides
Spraying gives only temporary control of a few days or weeks and isn't generally recommended. If you treat, Missouri Extension suggests a single application between late April and mid-June aimed at unkempt areas and lawn edges, not the whole lawn.[1][3]
Check your yard for chiggers
Lay a square of black paper or cardboard in the grass for about 10 minutes; the yellowish-red mites show up against the black.[3]
Chiggers are patchy, so check several spots, especially damp, brushy edges where small mammals and birds travel.[1][3]
Where sources disagree
Size: Missouri sources give about 1/150 inch for the larva; Ohio State gives 0.25 to 0.6 millimeter.[1][4][3]
Natural hosts: Missouri Extension lists rodents, birds, livestock, snakes and toads; the Missouri Department of Conservation says reptiles and birds are the main hosts; Ohio State says they prefer small mammals and birds.[1][4][3]
Which species: Missouri Extension names Trombicula alfreddugesi as the chigger people meet most often; a 2022 review says eastern U.S. specimens given that name were likely misidentified and should be called Eutrombicula cinnabaris.[1][6]
Common questions
- Do chiggers burrow under the skin?
- No. They feed from the surface through a hardened feeding tube, and the itch continues until your body breaks down their saliva and the tube and repairs the tissue.[1][3]
- Why do chigger bites show up under my waistband and socks?
- Chiggers crawl upward until tight clothing stops them, then settle and feed there, so bites cluster at sock tops, waistbands and bra bands.[1][3][2]
- How do I relieve chigger bite itching?
- MedlinePlus says antihistamines and corticosteroid creams or lotions may help. Contact a health care provider if the rash itches very badly or gets worse.[2]
Sources
- University of Missouri Extension, “Chiggers, G7398 (reviewed September 2017).” extension.missouri.edu/publications/g7398 (accessed 2026-11-11)
- MedlinePlus, U.S. National Library of Medicine, “Chiggers (Medical Encyclopedia).” medlineplus.gov/ency/article/001333.htm (accessed 2026-11-11)
- Ohio State University Extension, CFAES, “Chiggers (ANR-0182).” ohioline.osu.edu/factsheet/anr-0182-0 (accessed 2026-11-11)
- Missouri Department of Conservation, “Chiggers (Field Guide).” mdc.mo.gov/discover-nature/field-guide/chiggers (accessed 2026-11-11)
- Centers for Disease Control and Prevention, “Mosquitoes, Ticks, and Other Arthropods (CDC Yellow Book).” www.cdc.gov/yellow-book/hcp/environmental-hazards-risks/mosquitoes-ticks-and-other-arthropods.html (accessed 2026-11-11)
- International Journal of Environmental Research and Public Health, via PubMed, “Chen, Roe and Ponnusamy (2022), Biology, systematics, microbiome, pathogen transmission and control of chiggers with emphasis on the United States.” pubmed.ncbi.nlm.nih.gov/36429867/ (accessed 2026-11-11)
- Emerging Infectious Diseases, via PubMed, “Chen et al. (2023), Detection of Orientia spp. bacteria in field-collected free-living Eutrombicula chigger mites, United States.” pubmed.ncbi.nlm.nih.gov/37486323/ (accessed 2026-11-11)
- iNaturalist, “Trombiculidae taxon page (order and family).” www.inaturalist.org/taxa/245044 (accessed 2026-11-11)