Entity scope
Chigger refers to the parasitic larval stage of several trombiculid mites. Adults and nymphs have different ecology and do not bite people.
Quick identity
- Relevant stage
- Six-legged larva
- Later stages
- Eight-legged nymphs and adults do not feed on people
- Typical context
- Vegetation and ground-level outdoor habitat
- Identity limit
- Very small; species identification is rarely possible from a household photo
- Skin boundary
- A rash pattern is not proof of chiggers
- Visual status
- NO_VISUAL — no verified diagnostic reference used
Key characteristics
- The biting stage is a minute six-legged larva; later stages have eight legs.
- Color and appearance vary and useful details are difficult to photograph.
- Chiggers attach temporarily at the skin surface; they do not burrow into skin.
- Timing, outdoor habitat, clothing edges, and an actual specimen matter more than lesion shape.
Life stages
01
Larva
The parasitic six-legged stage that can attach to vertebrate hosts.
02
Nymph and adult
Free-living eight-legged stages that do not bite people.
Where it is found
- Low vegetation, grassy or brushy areas, leaf litter, and ground-level outdoor habitat where hosts pass.
- Exposure patterns vary strongly by season, climate, and local species.
Behavior and activity
- Larvae wait in vegetation or soil-level habitat and attach to passing hosts.
- Skin reactions may appear after exposure and persist after the mite is gone.
- A lesion cluster cannot identify the arthropod or exclude medical alternatives.
Associated signs
A compatible outdoor exposure plus a recovered larva is stronger than the location or appearance of a rash alone.
Common lookalikes
Overlapping itchy skin reactions with different exposure contexts.
Plant, fabric, or chemical exposure can produce similar irritation.
Host and habitat associations differ and require a specimen.
Why it matters
Exposure context is not a medical diagnosis
Chigger larvae can cause intense itching and dermatitis, but the skin response does not identify the mite or rule out other causes.
- Seek urgent care for breathing difficulty or other severe allergic symptoms.
- Get medical advice for spreading redness, fever, drainage, severe pain, or persistent symptoms.
- Do not apply household pesticides to skin or use unverified remedies.
Management direction
- Record where and when outdoor exposure occurred and avoid scratching or disturbing lesions for identification purposes.
- If identification matters, preserve an actual specimen rather than relying on the rash.
- Use healthcare guidance for symptoms and local Extension guidance for exposure reduction.
Have a pest photo to check?
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Identify a photoReviewed guidance and sources
Last reviewed August 2026. Sources support the claims listed with them; their limits remain part of the review.
- University of Minnesota Extension — Chiggers
Supports: Larval stage, habitat, exposure, skin-reaction boundary, and broad prevention context.
Does not support: Species diagnosis or medical diagnosis from skin appearance.
Scope note: North American outdoor context; species and season vary by region.