Chigger bite
A chigger bite usually shows up as intensely itchy red bumps, often with a tiny blister or hard white centre, bright red, appearing 3 to 6 hours after exposure — never immediate. It peaks around day 2 and generally lasts 1 to 2 weeks of itch. Clusters concentrated where clothing is tight is the usual arrangement.
| Looks like | intensely itchy red bumps, often with a tiny blister or hard white centre |
|---|---|
| Pattern | clusters concentrated where clothing is tight |
| Size | 2–10 mm |
| Appears | 3 to 6 hours after exposure — never immediate |
| Worst at | day 2 |
| Lasts | 1 to 2 weeks of itch |
| Itch | ●●●●● 5/5 |
| Pain | ●○○○○ 1/5 |
| Usually on | ankles, behind the knees, waistband, groin, under bra straps and sock lines |
| Active | May to September, daytime, in warm weather |
How to tell it apart
The giveaway is the geography of the bites: chiggers climb until clothing stops them, so bites cluster exactly along sock lines, waistbands and underwear elastic. The other giveaway is the delay — nothing at all for several hours after a walk, then severe itch that peaks the next day.
Where and when you meet it
Habitat: tall grass, berry patches, woodland edges and lawns in the South and Midwest.
Across 457 verified US records in the GBIF biodiversity database, sightings of Eutrombicula alfreddugesi concentrate in May, July, August, September. That is the window when bites are most likely — it is observation data rather than a guess, and it shifts with latitude.
States with the most recorded sightings
- Texas 326 records
- Georgia 28 records
- New York 17 records
- Louisiana 16 records
- Iowa 13 records
- South Dakota 12 records
- Kentucky 11 records
- Arkansas 10 records
- Indiana 7 records
- Alabama 4 records
- Florida 3 records
- Michigan 2 records
Record counts reflect where people report and identify specimens, not exact abundance. They are useful for ruling a species in, not for ruling it out.
Where it is recorded
| Country | Records | Peak months there |
|---|---|---|
| United States | 457 | May, July, August, September |
Verified records from the GBIF biodiversity database across the seven countries we cover. A country missing from this table means we have no records for it, not that the species is absent.
What it means for you
Chiggers do not burrow into skin and do not stay there, contrary to the folklore. The larva attaches, feeds on liquefied skin cells through a feeding tube, and drops off — usually well before the itch starts. That is why suffocating the bite with nail polish or bleach achieves nothing except irritated skin.
Seek medical care if
- spreading redness, warmth or pus from scratched bites
- fever
Care at home
- shower with soap as soon as possible after exposure — this removes larvae that have not attached
- cold pack, antihistamine, hydrocortisone cream
- nail polish on the bite does nothing; the mite is long gone by the time it itches
Preventing the next one
- tuck trousers into socks in tall grass
- permethrin on clothing
- shower and change clothes within a couple of hours of exposure
Common questions
How do I know it was a chigger?
The giveaway is the geography of the bites: chiggers climb until clothing stops them, so bites cluster exactly along sock lines, waistbands and underwear elastic. The other giveaway is the delay — nothing at all for several hours after a walk, then severe itch that peaks the next day.
How long does a chigger bite last?
Typically 1 to 2 weeks of itch, peaking around day 2.
When is it a problem?
Seek care for: spreading redness, warmth or pus from scratched bites; fever.
Can it transmit disease?
No human disease is known to be transmitted by this species in the United States. The practical risk is infection from scratching.
Get a photo assessment in the app
Everything above is free to read. The app adds what a page cannot: point your camera at the bite and get an assessment of the most likely cause, a severity read, and a day-by-day care plan — including the specific signs that mean you should be seen.
iPhone and iPad. Free to download.